MSIR.0413 Attempt to load multiple fields (target1) and (target2) from (source) but FAMSPLIT not set
This message indicates that an LAI statement was issued in a FLOD program, and field 'source' has data which would cause a split of a family into fields 'target1' and 'target2' which are no longer in the same family.
See the Fast/Reload Reference Manual for an explanation of family splits.