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Error When Submitting OSS Sales Order via Integration

edited Sep 15, 2025 6:52PM in Ask A Guru 5 comments

Hi,

We’re facing a critical issue preventing us from submitting Sales Orders via integration when using a valid OSS tax code.

We receive the following error:

"One or more selected items use a different sales tax rule than the others on this transaction. Transactions can only contain items with the same tax rules. Create separate transactions as required."

All items in the transaction use the same OSS tax code, and the VAT Reg. Number field on the customer is empty, yet the system still blocks the order.

We need help understanding what causes this error and how to resolve it.

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