A transmitter may be known through a grandfather or more remote ancestor rather than by his immediate father. This shortened form need not conflict with the complete lineage; it simply foregrounds a more prominent ancestor.
Problems arise when a reader mistakes the short and full forms for two people, or assumes that generations omitted in the shorthand did not exist.
For instance, “X ibn [grandfather]” and “X ibn [father] ibn [grandfather]” can represent one person. The entire genealogical sequence must be checked before drawing a conclusion from an abbreviated name.