Error: Cannot change primary ID (itemMatrixID)

There was an error when importing item with description 'Description': BadRequest: <?xml version="1.0"?> <Error><httpCode>400</httpCode> <httpMessage>Bad Request</httpMessage><message>Cannot change primary ID (itemMatrixID) of model_ItemMatrix once it has been set.</message><errorClass>PrimaryKeyError</errorClass></Error>

This error means that the import template included a line item which has already been assigned to a Matrix in Lightspeed and the import is instructing Lightspeed to do one of the following:

1. Reassign the item to a new Matrix.
2. Remove the item from the Matrix.

We've confirmed in tests that Lightspeed does not allow items to be removed from a Matrix via their API, even when trying to assign them to a new Matrix.

An alternative solution here would be to do the following:

1. Within Lightspeed manually remove these items from the matrix they're assigned to. This can be done in each Lightspeed Matrix by navigating to the Matrix Setup page, and clicking the X next to each group item you want to remove.
2. If these items need to be assigned to a new matrix, a new import can be processed via DataTools to assign the now unassigned items to new matrices in bulk.

Please contact Accumula Support if you have any questions.