Diagnosis
You tried to reset the Standard address indicator when updatingan address.
This is not permitted, because otherwise there would be no addressesmarked as the standard.

Procedure
Set the value 'X' for the standard indicator if you want to keep thisaddress as the standard address.
If you want a different address to be used as the standard address,then set the indicator for this address. The indicator for the previousstandard address will be automatically reset.