vendor tax number in BP being replicated from ERP to CRM

[malcolmclark]

Hi, we are currently converting to S/4 HANA and have issues with a Z function module that creates Vendors in transaction BP. All works fine in ERP but it is then trying to update tax numbers in CRM via our middleware...which is not what we want. The creation of the BP is fine as that does not get through our filters. But when the FM tries to change the BP by adding tax numbers to the Identification tab using FM 'BAPI_BUPA_TAX_ADD', that gets through the middleware filters and into CRM.

I'm guessing we're using the wrong FM to update the tax numbers and need one with a grouping, but so far I haven't been able to track one down.

Can anyone offer any advice to a middleware novice please?

thanks,

Malcolm.