Can ATC object to something that is NOT wrong in the first place
On the face of it, this seems to suggest that ATC has either misunderstood, or misinterpreted, Pans Ops. However, there may be other issues that are relevant to ATC in your area of ops,
FlyinWithoutWings.
I think that, rather than conjecture the reason, it might be a good idea for your company to ask them about it. Perhaps you can suggest that your Fleet Captain put in a polite letter that seeks clarification from them.
Or maybe there's an ATCO or two floating around here who can shed some light on it for us?