His dudeness,
just out of curiosity, what kind of rejection (not accepted FPL) message did you get from IFPS system?
Simply checking the FPL in the publicly available "FPL tester" on Eurocontrol's NOP portal gives no errors (picture below - all data except TYPE, DEP/DEST and ROUTE are made up just to pass the FPL).
IFPS is complex and generally working quite ok (it takes into account huge amount of data, tens of thousands of flights, regulations, restricitons, military zones... etc. - but true, climb/descent profiles can be an issue sometimes, however solvable).
