What is difference between Delete subscriber data and cancel location procedures?

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

Both the procedures are triggered by HSS only but the objective of having both the procedures are different.
Delete subscriber data procedure: HSS initiates this procedure over the S6a interface when there is a removal of any subscription data from user profile. Whereas the use of cancel location procedure is to notify MME that UE location got changed now . For example: UE moves from one MME to another MME due to mobility or any other reason.

Comments

but there is a cancellation type subscription withdrawl is present to delete subscription data from MME in CLR message plz clarify it

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I also have the same understanding as Ganesh explained, but could not understand the comment. Can you clarify more on your comment?

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though CLR also we can delete subscriber data and using Delete subscriber data also we can delete subscriber data so why 2 procedures are implemented for same objective?