BOM mapping with change number error during IDoc process

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Hi all,

i am creating BOM using IDoc BOMMAT04.i have checked this IDoc will use FM IDOC_INPUT_BOMMAT inside.

in this function module, it is using FM CSAP_MAT_BOM_CREATE and CSAP_MAT_BOM_MAINTAIN to create and change.

currently, creation and deletion is success. but when change, if the change number passed as an input parameter, the IDoc process error saying that the BOM header not allowed to update for read-only field.

if i not pass the change number, the change will be success, but no change number displayed in the item. that is not the user expected.

and if i delete the bom with change number, create a new BOM for the same material is not aloowed, saying that BOM already existing.

it seems that CSAP_MAT_BOM_CREATE and CSAP_MAT_BOM_MAINTAIN cannot support much. it is limited.

can anyone have any good solutions? thanks!