Difference between Cancal Location Procedure and Delete Subscriber Date Procedure initiated by HSS?

Question

In Diameter S6a specification (3GPP 29.272), it is indicated that the full procedure for Delete-Subscriber-Data from the HSS should be described in the 3GPP 23.401
However, I don't see any clear reference there.
Do you know where I can find it, especially for the deletion of one of the APN-configuration in the MME

Answer 1

CLR command, indicated by the Command-Code field set to 317 and the 'R' bit set in the Command Flags field, is sent from HSS to MME/SGSN. If the Node-Type-Indicator information has been previously received as cleared in the ULR-Flags during update location procedure for the MME, the HSS may skip any removal of the SMS/LCS-related subscription data and consequently does not have to make use of the Delete Subscriber Data procedure to update the subscription data in the MME.