Joining 2 arrays from the same output via identifier fields MAT_DOC and DOC_YEAR

Good day! Starting my Snaplogic journey and it has been interesting so far.

Need help on proper Snap to use, I'm assuming Mapper to be able to join 2 arrays from the same output which is a SAP Execute BAPI Snap.

Expected output is a joined array or table of $GOODSMVT_HEADER and $GOODSMVT_ITEMS.

Appreciate the help!