i corrected the problem by updating line 139:
$WA_fieldValuesStr = "".WA_AB_getLoopedFieldValue("WADA_RepeatID_OptionID", $WA_multipleUpdateCounter) ."";
to:
$WA_fieldValuesStr = "".WA_AB_getLoopedFieldValue("ProductOption", $WA_multipleUpdateCounter) ."";