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The MP2-F12, CCSD-F12, and UCCSD-F12 methods must use conventional (non-density fitted) spin-restricted Hartree-Fock reference functions (HF or RHF).
DF-HF cannot be used for these methods. This restriction is necessary to ensure that the Fock matrix is diagonal and
consistent with the integrals used in these methods.
For DF-MP2-F12, DF-LMP2-F12, and DF-RMP2-F12 either HF or DF-HF reference functions can be used.