Activate the Sales Order Header field VBAK-KNUMA in VA01 and VA02 transactions

Hello Gurus,

    I request to activate the Sales Order Header tract VBAK-KNUMA successful VA01 and VA02 transactions truthful that it becomes disposable for update. The tract shows successful VA03 though and successful VA02 successful show mode only. In VA01 its not disposable astatine all. Hence, immoderate update utilizing IDOC is not imaginable adjacent erstwhile we walk the close qualifier. I tried doing it utilizing the transaction SHD0, but I was incapable to find the tract for the surface variants for SAPMV45A. Any suggestions for achieving it would beryllium truly helpful.

Thanks for your assistance successful advance.

Regards

Anustup Chakrabarti