Tax code not populated after submitting change request on purchase requisition

Hi,

We are running into a taks issue after performing changes to existing requisitions.

The problem is that, when a change is submitted the PO get a revision, but tax code is not copied to the PO and therefore revised PO's are sent to suppliers without tax.

The taks amount, however remains present on the requisition. Somewhere in the update of the PO, the taks is not populated.

This problem only occurs for suppliers for which no tax code is defaulted and the code needs to be selected from the lov.

We allready deployed patch 11694368, 11793045 and 11817727.

We are on R12.1.2.