Error in change number creating BOM in Engineering Type.

Can anyone guys help me with my problem.

I'm creating Bom using BAPI_MATERIAL_BOM_GROUP_CREATE.

Every time I create BOM Using one bom only in engineering and all BOM for materials were created.

But every time i create rerun the program and have different change number on its components, the error occur,

"Generation not Supported for Change number"

Can anyone help me with this?

Thanks and God Bless.