PO Net Price in line item does not remain in field despite being maintained.

Dear experts,

Problem happened when I inserted net price at po line item.

Once I hit ENTER, the field net price became empty, net value showing zero but PBXX amount field adopted same price.

I am using standard pricing procedure RM0000 and no schema group assigned in both BP and schema determination. ( I copied RM0000 and created YY0000; contents remains unchanged)

No PIR involvement as this is non-material purchase. ( free text )

Hereby i attached the pricing procedure and PO behaviour screenshots for your reference.

Look forward for ideas and guidance.

Thank you.

Regards,

Azizul

p/s: in screenshot ME21N, label 1 indicates 50000BND has been inserted at PO line item > net price but onceyy0000-1.jpgyy0000-2.jpgyy0000-3.jpgme21n.jpgpricing-analysis.jpg

hit ENTER, it became empty but at the same time updates PBXX amount. Net value remains zero.