Thanks for the response. By the way, I hope your date stamp is off on your machine!
Attached is the form in its most simplest form. I left the rule in that was throwing me an error.
Basically, the secondary data, 3 columns, id, descript, and check box. Check box sets rule to post " id" to "rowid" field.
Rule1: "Rowid" trips the rule "if checkbox =yes" "concat(rowidconcat,",",Rowid). And my string grows nicely as expected, problem is if I uncheck the box can't remove the "id".
Rule2: "Rowid" trips the rule "if checkbox =no" "concat(rowidconcat,",",-Rowid). Obviously the -rowid causes an " NaN". Not sure how to subtract the rowid, if its already been added to the concat string.
Your thoughts?