You’re past “should we do this?” The ERP is selected. Now comes the part where implementations stall, run significantly over budget, or go live broken.
B2B distributors and manufacturers tend to fail at the same predictable points: scope creep that doubles timelines during requirements, data ownership disputes between IT and operations that stall configuration, corrupt customer pricing that surfaces the week before cutover, and eCommerce integration that gets under-scoped and breaks post-launch. Every one of those failure points is preventable. This ERP checklist walks through each phase with the specific verifications that catch problems before they become post-launch emergencies.
ERP Implementation Phase Risk Matrix
| Phase | Primary Failure Point | Prevention Checkpoint |
|---|---|---|
| Requirements Gathering | Week 3–6: “Can we also add…” requests significantly expand scope | Formal change control with cost and timeline impact required for all additions |
| Stakeholder Alignment | Month 2: IT and operations deadlock on data ownership | Executive sponsor with veto authority assigned before kickoff |
| Data Migration | Week before cutover: customer pricing tiers don’t map | Validation scripts run 90 days pre-launch, not 30 |
| Configuration and Testing | UAT: workflows don’t match real transaction patterns | Test scripts cover 95% of actual order types, not just standard paths |
| eCommerce Integration | Week 3 post-launch: batch sync creates oversell situations | Real-time sync or inventory buffers configured before launch |
| Go-Live | Day 1: system performance degrades under real load | Load testing at 3x expected volume completed pre-launch |
| Post-Launch | Weeks 1–4: data corrections consume the ops team | Automated error queues and escalation protocols active at cutover |
Requirements Gathering: Lock Scope Before Configuration Begins
Requirements gathering and requirements lock are two different milestones. Have you locked scope before configuration begins, or are you still accepting additions in month four?
Required before configuration:
- Current-state workflow documentation completed. Teams that skip this step discover in UAT that the new system fails on exception scenarios representing a significant share of actual order volume.
- Formal change control established. Every post-signoff request gets a written cost and timeline impact estimate before approval.
- Customer-specific pricing structures fully mapped. Contract pricing, volume tiers, promotional rules, and rebates need to be documented before configuration starts.
- Integration points identified for every system touching order data. ERP, CRM, WMS, EDI, and eCommerce platforms each belong on the list if they touch order data. Missing one creates a post-launch emergency.
Have you locked requirements and established change control, or are scope additions still being approved verbally?
Stakeholder Alignment: Define Decision Rights Before Configuration Starts
Once scope is locked, internal politics become the primary threat to the timeline. IT wants centralized governance. Operations wants department-level control. Finance wants audit trails.
Required before configuration:
- Executive sponsor assigned with decision authority. When IT and operations deadlock on whether eCommerce pricing pulls from the ERP or gets managed separately, someone needs veto power.
- Data ownership documented in writing. Define who owns customer master data, product catalog updates, inventory adjustments, and pricing rules before anyone configures the system.
- Compliance requirements captured by department. If your CFO raises audit trail requirements in month five, you’re reconfiguring approval workflows and pushing go-live.
- Change management needs mapped by user group. Waiting until the week before launch to assign training by role guarantees low adoption.
Have you documented decision rights and escalation paths, or are you assuming stakeholders will work it out as conflicts surface?
Data Migration: Validate Pricing 90 Days Out, Not 30
Legacy data is never as clean as you think. Customer records contain duplicates with conflicting payment terms. Product master data has inactive SKUs flagged as active. Customer-specific pricing exists in spreadsheets, email threads, and sales rep notebooks.
Required 90 or more days before migration:
- Data profiling completed with time to fix findings. Common issues: duplicate customer accounts, orphaned pricing tiers, and product hierarchies that don’t map to the new system’s structure.
- Customer-specific pricing validated against at least the last 12 months of invoices. If contracted rates don’t match what customers actually paid, you are launching with pricing disputes built in.
- Product catalog mapping tested across all integration points. SKU formats, UOM conversions, and hierarchies must align between ERP, eCommerce, WMS, and EDI.
- Fallback protocols established for unmapped records. When records fail validation, do they route to a review queue, default to standard pricing, or block the entire import?
Teams that run profiling at 90 days fix problems before cutover pressure turns every decision into a triage call.
Have you mapped customer-specific pricing tiers before cutover, or are you planning to fix them after go-live?
Configuration and Testing: Cover Real Transactions, Not Ideal Ones
A configuration built on assumptions fails in UAT. Testing that covers only standard transactions fails on day three of production.
Required before UAT sign-off:
- Workflows validated against actual transaction volumes. If exception handling accounts for a quarter of your orders, test scripts must cover those scenarios.
- Integrations tested under load. Can your eCommerce-to-ERP sync handle peak order volumes, or does it queue and delay order confirmations for extended periods?
- Multi-branch inventory logic verified. Can customers see available-to-promise inventory across all branches, or does the storefront only check the default warehouse?
- Customer portal access tested by account type. Session management issues that expose one customer’s pricing to another account should be spotted in UAT, not in production.
Have you run test scripts against your top transaction types and actual exception scenarios, or only against standard orders?
eCommerce Integration: Verify the Workstream That Breaks Most Launches
This is where B2B distributor ERP projects stall most often after go-live. ERP implementations treat eCommerce integration as an afterthought. Then week three hits: inventory oversells because batch sync runs on a delayed cycle, customer pricing displays incorrectly for logged-in accounts, and online orders never write back to the ERP.
Your ERP checklist must confirm each item below before eCommerce launch:
Sync Type:
- Real-time vs. batch determined and configured? Real-time sync keeps inventory accurate but increases ERP load. Batch processing reduces server load but creates oversell risk during high-volume periods.
- If using batch sync, are inventory buffers in place? A safety stock reserve protects against overselling between sync cycles. Without it, batch processing and high order volume create a predictable conflict.
Customer-Specific Pricing:
- Does the integration pull contract pricing by customer account in real time? B2B buyers expect to see their negotiated rates when they log in. Displaying list price adds friction to every transaction.
- Have tiered volume discounts and date-sensitive promotions been tested? Many integrations fail to apply volume-based discount rules or promotional pricing that overrides contract rates.
Multi-Branch Inventory:
- Does the storefront display available-to-promise inventory across all branch locations? Or does it check only the primary distribution center while regional branch stock sits invisible?
- Is ship-from logic configured for multi-branch fulfillment? When inventory is distributed across multiple branches, the system should automatically route orders to the optimal fulfillment location.
Order Write-Back:
- Do online orders write back to the ERP immediately with confirmation? Delayed write-back means no acknowledgment emails, and inside sales can’t see eCommerce orders when customers call.
Have split shipments and backorders been tested? Integration failures occur frequently when partial inventory requires splitting one web order into multiple ERP sales orders.
Monitoring:
- Is a dashboard showing sync status, API response times, and failed transactions live before launch? Operations teams need visibility into integration health before customers report problems.
- Is there a protocol for failed orders? If an order fails to write back, it needs to retry automatically, alert the ops team, or both.
For distributors running Prophet 21 or Infor, the default path is a 6–10 week custom integration build. Point-to-point connections lack a middleware layer to absorb platform changes, so they frequently break after ERP updates. Sirius by Atwix is the pre-built alternative: a middleware platform built for B2B distributors that handles real-time sync, customer-specific pricing, and multi-branch inventory without custom code.
Go-Live and Post-Launch: Stabilize Before You Stand Down
Go-live is not the finish line. The first 30 days determine whether the implementation holds or spends months in firefighting mode.
Required for the first 30 days:
- Parallel operations run for at least one full order cycle. Process orders in both old and new systems to verify accuracy before full cutover.
- War room staffed for the first two weeks post-launch. Response speed determines whether issues become minor corrections or customer-facing failures.
- System performance monitored under real load. Page load times, API response rates, and database queries all degrade under production volume when pre-launch testing didn’t match actual traffic.
- Escalation protocols in place for data correction requests. When customer service finds 200 accounts with incorrect pricing, a batch-fix process needs to already exist, not 200 individual IT tickets.
Have you planned for 30 days of post-launch support capacity, or does your plan assume the team disbands at go-live?
Treat This ERP Checklist as a Guide, Not an Afterthought
Each phase in this ERP checklist has a known, preventable failure point. The implementations that stall or go over budget are the ones where teams deferred a verification step and assumed they’d fix it after launch. Work through each section before moving to the next phase, not after problems surface. For distributors running Prophet 21 or Infor, Atwix has delivered more than 250 ERP integrations for manufacturers and distributors and built Sirius specifically to eliminate the post-launch failures that custom integration builds leave behind.
Talk to an Expert at Atwix to review your integration timeline and reduce the risk of post-launch failures.