How to fix the quickbook ref number not showing on WorkPal

No Quickbooks ref number showing

If after exporting an invoice to quickbooks, the QB Ref Num doesn't get populated (see screenshot below)  please follow the below steps

Check that the Quickbooks account has "Custom Transaction Numbers" toggled turned off.  This Can be found by going to quickbooks and then selecting the below options: 

Gear Icon > Account and Settings > Sales > Sales form content