CSAI_BOM_MAINTAIN issues when I change WBS BOM

Hi gurus,

I have a customer that uses WBS BOM. THe BOM's are created using T4S Engine.

If I create a BOM for first time, I don't have any issue. If I want to update this BOM with new component or delete component that already exist, I have a lot of issues... The BOM is not updated correctly

DO you have how I can use this BAPI in order to change / delete component in WBS BOM?

Thanks

Regards

Raffaele