Name of lock parameter & invalid since it does not start with a letter

What causes this issue?

The name of a <DS:TX.DDDOK_ENQU_PARAMETER>lock parameter</> of the lock
object in question does not begin with a letter. This is not allowed.

System Response

The action is cancelled.

How to fix this error?

In the maintenance transaction of the ABAP/4 Dictionary give the lock
parameter a name which conforms to the
<DS:TX.DDDOK_ENQU_PARAMETERNAME>name conventions for lock
parameters</>.

Error message extract from SAP system. Copyright SAP SE.