billing cogs inconrrect

we have one order related billing document, no outbound delivery, COGS value field is mapped to VPRS condition type, COGS value field is populated 1200 MYR during billing, but since this is no delivery, COGS GL account will not be posted. this cause PA and FI not tally.( FI is zero, but PA is 1200 MYR)

how to resolve the error?