Enter a valid form of address

What causes this issue?

You have entered a form of address "&V1&" which cannot be found in the
table of valid values (T535N).

How to fix this error?

Press F4 to display a list of valid values and select a value from the
list.
If you need a new form of address, name prefix or affix, please go to
Customizing and maintain these values in table T535N.

Error message extract from SAP system. Copyright SAP SE.