A curious pre-flight warning...

[TomHeintjes]

I was going to export a Publisher file as a PDF/x (for printing grayscale, no transparencies). Pre-flight tells me the color settings are incompatible for that type of PDF export. But I recently created another similar project (grayscale, no transparencies), and pre-flight didn't throw up any red flags. I set the document up for grayscale, so I'm not sure what the color settings even are. Any thoughts on how I might make pre-flight happy? (I'm working in v2.4.)

[PaulEC]

I'm not an expert, but it could depend on which version of PDF/x you're using. If you're using 1a try 3 instead.

[TomHeintjes]

Thank you...I WAS in fact trying 1a...I'll try 3 instead. Much appreciated!