ParseWith Microflow is not getting called

hi, i have given a ParseWith MF for 1 of the excel template columns. All works fine but this ParseWith MF is not getting called at all and there by not doing what i need.   Any idea what additional 'configuration' 1 needs to do, to get the 'StartImportByTemplate'(default in ExcelImporter module) identifiy 1 of the template columns is a ParseWith?
1 answers

I figured out myself. The ExcelImporter doesnt call the ParseWith MF if the incoming attribute is NULL!