CONDITIONTABLE in /guixt/select: I'm using the function module /guixt/select where I set the "CONDITION"  parameter as "MATNR = '....'" and in "CONDITIONTABLE" I specify a list of further conditions (supplier numbers). This doesn't work; what could be the reason?

When you use CONDITIONTABLE, the CONDITION parameter is ignored. Add the MATNR condition to the CONDITIONTABLE.