Where G/L Class on P4314 derives from when entering a new line?

Hi,

During the voucher match from P0411 when I entered a new line with line type J, the G/L Class has not been filled in with the G/L Offset of the supplier specified in the supplier master but with a different G/L offset code.

Does anyone know where the G/L Class (APC) derives from, when entering a new line in P4314 during voucher match?

Thank you

Antonis Aridas