Invoice Correction Request- Both the lines with G2N
I am facing a problem while using a standard invoice correction request with reference to billing document.
In the standard SAP, there should be 2 line items created one with item category G2N and one with item category L2N which we can change the quantity and price.
In my system I got both line with the same item category G2N and hence I can not perform any changes to the line item.
In the Copy Control Setting, I see source item Category TAN AND TARGET G2N AND L2N which is how it should be for Invoice correction requrest.
I see the Item category determination for RK - - G2N and RK--G2N G2N (some of the SAP documents say it is standard and no need of L2N in the determination). Still, I tried with changing L2N as well in the default with header item being G2N but no luck.
Is this a bug in standard SAP? Do we need to apply some notes? Or Is there any specific config/routine to be applied?
Request your help in this.