  We show that formally for the standard ansatz relativistic point-coupling
mean-field (RMF-PC) model a lagrangian density L is not equivalent in Hartree
and Hartree-Fock approximations. The equivalency can be achieved only if we use
a ``complete'' ansatz at the cost of introducing new parameters in the model.
An approximate treatment of the exchange terms from standard RMF-PC indicates
that these effects cannot be easily, if at all, absorbed by a Dirac-Hartree
approximation.
