[Freesurfer] Correction of registration in preproc-sess stream

Dear freesurfers,

I have a simple question concerning the freesurfer 5.1 FSFAST preprocessing. In the preprocessing the functional images are registered to the anatomical ones using bbregister. This is the 3rd in a series of 8 preprocessing steps. If the preproc-sess registration fails it is possible to achieve a proper registration using various options of bbregister. Does it suffice to replace the register files created during the preprocessing with the ones received during the registration correction in order to attain proper preprocessed data or are there routines in steps 4 to 8 in the preprocessing which rely on the registration?

Thanks in advance

pfannmoe