... the 12 tag's are build as expected Also when only the 12-th tag is build , it gpf's The last test was : change the indexexpression to one from the previous tag's , and indeed it works. So i suppose it must be the indexexpression that confuses msgmeter : (:cIndExpr) RIGHT(STR(YEAR(ADDMONTH(fakdat,114)),4),2)+PADL(ALLTRIM(UPPER(boeknr)),5) ...