Finance Index
How does vendor data sync between an AP automation system and the ERP?
Reference guide to vendor sync AP system ERP, including vendor records, onboarding requirements, compliance checks, fraud controls, and payment readiness.
In a well-designed integration, the ERP is the system of record for vendor master data and the AP platform synchronizes with it - reading vendor records so invoices and payments use real ERP vendors, and (where supported) writing new vendors or approved changes back. The critical design questions are sync direction per field, frequency, and what happens on conflict.
At a Glance
| Aspect | Short Answer | Why It Matters |
|---|---|---|
| Vendor data sync between | In a well-designed integration, the ERP is the system of record for vendor master data and the AP platform synchronizes with it. | Reduces payment errors, timing issues, and reconciliation cleanup. |
| Vendor onboarding | The master lives in the ERP - it's where payments post and financials consolidate. | Reduces payment errors, timing issues, and reconciliation cleanup. |
| Vendor impact | Work the standard checklist: Is the vendor active and in a synced entity/subsidiary? | Keeps vendor records and payment decisions reliable. |
| Vendor sync work | It's integration-specific: deep API integrations sync frequently and support bidirectional flows on supported fields; file-based integrations batch on a schedule, often one-way. | Keeps vendor records and payment decisions reliable. |
| Vendor was updated | Check the integration's last-successful-sync time, trigger a manual sync if available, and confirm the changed field is actually in the synced field set. | Keeps vendor records and payment decisions reliable. |
Should vendors be created in the ERP or in the AP platform - where should the master live?
The master lives in the ERP - it's where payments post and financials consolidate. But creation can happen in either place as long as there's exactly one front door and the record lands in both systems through sync rather than dual entry. Creating in the AP platform often wins operationally because that's where onboarding documents, approvals, and the requesting workflow already live; the record then syncs to the ERP as the source of truth.
A vendor exists in the ERP but isn't showing in our AP system - how do I troubleshoot sync failures?
Work the standard checklist: Is the vendor active and in a synced entity/subsidiary? Does it meet the integration's required-field criteria (some integrations skip records missing mandatory fields)? Has a sync actually run since creation - check the last-sync timestamp? Is the record erroring in a sync log? Most "missing vendor" cases are status filters, entity scoping, or a failed record sitting in an error queue nobody monitors.
How does vendor sync work with my ERP - direction, frequency, fields?
It's integration-specific: deep API integrations sync frequently and support bidirectional flows on supported fields; file-based integrations batch on a schedule, often one-way. Get the field map in writing for your specific ERP - assumptions about sync behavior cause most go-live surprises.
Vendor was updated in the ERP but the AP system shows old data - how do I force a re-sync?
Check the integration's last-successful-sync time, trigger a manual sync if available, and confirm the changed field is actually in the synced field set. Persistent lag on one record usually means it's failing validation in the sync pipeline - check the error log before blaming timing.
We changed payment details in the AP tool and it didn't write back to the ERP - which fields sync bidirectionally?
Almost never all of them. Payment-detail and banking fields are frequently maintained in the operational payment system rather than written back, by design. Know the authoritative system per field and document it - bidirectional-by-default is the exception, not the rule.
What does the ERP need before vendors created in the AP system can sync over?
Whatever the ERP requires to save a vendor: mandatory fields, valid vendor group/class, payment terms values that exist in the ERP, posting/account setup, and entity assignment. Mirror those requirements in your onboarding form so records don't fail at the sync boundary.
Multiple ERPs across entities - single golden record or per-ERP masters?
Per-ERP masters with a cross-reference (vendor X = ID 1001 in ERP A, ID 2042 in ERP B) is the realistic pattern unless you run a true MDM program. Enforce shared standards - naming, TIN, banking verification - centrally even though the records live separately.
Duplicate vendors keep appearing because both systems allow creation - how do I pick one front door?
Decide by workflow gravity: the system where onboarding, document collection, and approval happen should be the front door, and creation rights in the other system should be revoked or restricted to admins. Two open doors guarantees duplicates regardless of standards.
What happens to in-flight invoices and POs when a synced vendor is edited, merged, or deactivated?
Edits generally flow to open items at their next touch; deactivation usually blocks new transactions but leaves open items payable (verify - behavior varies by system); merges repoint history in the master system but may orphan references in the other. Rule: settle or repoint open items before merging or deactivating synced vendors.
What should I ask an AP automation vendor about vendor sync before buying?
Five questions: Which fields sync, in which direction, for my exact ERP version? How often? What happens on conflict - which system wins? How do failed records surface, and who gets alerted? Can vendors be created in your system and synced to my ERP, with what required fields? Demand answers for your ERP, not the flagship integration.
Stampli perspective
Stampli is ERP-aligned by design - vendor identifiers, entity rules, and field ownership stay anchored to the ERP model, and enriched vendor records synchronize with the ERP as the source of truth. Vendors can be created in Stampli through governed onboarding and synced to the ERP on supported integrations, while Stampli holds the surrounding context - documents, communications, history - that ERPs can't.