после долгих раздумий вылетает с ошибкой CD328 (Transfer table would lead to a duplicate record in CDPOS/CDPOS_UID).

BAdI definition | Interface | Note number
CUVT_CHANGE_DOCUMENTS | IF_EX_CUVT_CHANGE_DOCUMENTS | 1454311

Customizing that allows you to deactivate change documents of variant tables does not exist. If you process large datasets, for example using transaction CU60E, writing change documents may be undesirable.