Commingling and Job Filtering

I have a job that requires both commingling (“Letters” and “Notices”) and filtering. The “Letters” data file has a field acting as a print flag, and in my Job Presets I filter on this field to produce “output for print vendor” and “output for internal”. The “Notices” data file doesn’t have this field/flag.

I’m struggling with how to build this process. I can do the commingling easy enough, to marry each Letter with its corresponding Notice. It’s the subsequent “Create Job” step(s) that throw a W4206 error: Metadata does not contain valid Content Set Item Collection.

How do a commingle Content Items, and then subsequently create two separate, filtered, jobs from that? If I have 50 Letters, I will have 50 Notices, and they “join” on a common field. Of those 50 Letters, let’s say 40 print and 10 don’t. I want an output of 40 Letters+Notices and a separate output of 10 Letters+Notices.

The Job Preset is filtering properly, if my job was Letters only I’d be good, but since I’m commingling the Notices first, my Job Presets fail.

UPDATE: I decided to forego trying to get commingling to work for this job. Instead, I output all the “notices” first as PDFs and in the “letters” template use dynamic imaging to add them to the template. Then I can filter/group/separate the “letters” job with standard Job Presets and Output Presets.

Still, it would be nice to know how to use Job Presets against commingled content items.