If an identity mapping profile defined in a USER profile LNOTES or NDS segment does not exist, RACF® authorization checking is not able to retrieve the RACF user ID for an application user identity, and ALTUSER and DELUSER command processing cannot locate the target mapping profile. In these situations RACF issues message IRR52151I. To correct the problem:

1. Delete the identity segment (NDS or LNOTES) of the USER profile corresponding to the missing mapping profile. Do this by issuing the ALTUSER command with the NOLNOTES or NONDS operand.
2. Recreate the identity segment using the ALTUSER command with the LNOTES or NDS operand, specifying an application user name. RACF automatically creates a corresponding identity mapping profile in the NOTELINK or NDSLINK class.