In order to enable the ANSI X9.8 PIN - Allow modification of PAN access control point, the ANSI X9.8 PIN - Enforce PIN block restrictions must also be enabled. The ANSI X9.8 PIN - Allow modification of PAN access control point cannot be enabled by itself.

When the ANSI X9.8 PIN - Allow modification of PAN access control point is enabled, the input PAN and output PAN parameters will be tested in CSNBPTR or CSNBSPN. The input PAN will be compared to the portions of the PAN which are recoverable from the decrypted PIN block. If the PANs compare, then the account number will be changed in the output PIN block.