I am creating a disk filename that includes a date and time stamp (with a space between the date and time) and am storing in the document property. I then have a map step where I have a userdefined function to read that filename, remove the space and write it back to the filename document property. I have a dummy input and output parameter as shown below. It does not appear that the UDF is being executed and I'm wondering if I must have an input value to force execution? Otherwise I'm not sure what I'm doing wrong here. I also tried the whitespace trim realizing that it only removes beginning and ending spaces. Thoughts?