uncheck PP-firmed (ORDER_PP_FIXED) with BADI

Please,

I need to solve a issue of a process that create a purchase requisition with the fields bellow checked:

u2022 PP-Firmed (ORDER_PP_FIXED)

u2022 Input Firmed (INPUT_FIXED)

u2022 Output Firmed (OUTPUT_FIXED)

Iu2019ve to uncheck them. I was able to uncheck u201CInput Firmedu201D and u201COutput Firmedu201D in /SAPAPO/IF_EX_DM_PO_CHANG2 BADI,

But I wasnu2019t able to uncheck PP-firmed. Has anyone already done that?

Thanks in advance

Best regards