I think you can probably manually add some code to do this on line 237.
I think you can update it to:
if (WA_AB_checkLoopedFieldsNotBlank(array("SAType"), $WA_mrtLoopCounter) && WA_AB_checkLoopedFieldsNotBlank(array($WA_joinLoopedField), $WA_mrtLoopCounter) && WA_AB_getLoopedFieldValue($WA_loopedField, $WA_mrtLoopCounter) == WA_AB_getLoopedFieldValue($WA_joinLoopedField, $WA_mrtLoopCounter)) {