delivery item

Hello Friends,

*What is Xlips in the following code*

form userexit_save_document_prepare.

case xlips-pstyv.

when 'TAX' or 'REX'.

• Accept this two Delivery item category

when 'REN'.

if xlips-lgort = space.

• Reject this Delivery item category

message e001.

endif.

when others.

if xlips-matnr <> space.

• Check storage location not space

if xlips-lgort = space.

message e002.

endif.

• Check delivery quantity not zero

if xlips-pikmg < 1.

message e003.

endif.

endif.

endcase.

endform.