How can I go about joining the SINVOICED table to the STOJOU table?

SOLVED

As seen in the subject, I am looking to join the STOJOU table to the SINVOICED table without the use of the ITMREF column. Data models show a one way arrow from STOJOU to SINVOICED with VCRNUM;VCRLIN. I am unsure of what to do with that, with VCRNUM only existing on the STOJOU table. Any help would be greatly appreciated. Thanks in advance!