I'm big fan of CMD_EI_API and VMD_EI_API classes. I use them to create, update and delete customer and vendor master data, including contact persons, partners and all data you have in XD02/XK02 transaction. Also to update Z fields from all customer and vendor related tables. But lately after upgrade from 7.40 SP5 to 7.40 SP16 the method maintain_bapi was not saving the changes to the customers.
After a while I've found out that I have to call additionally the method update_modules and now the customer was saved.
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