SAP Message 54303 - Cannot copy & to & because & already exists

Diagnosis
You chose automatic assignment of a customizing wage type andthen entered the two parameters to create names for the customizingwage types automatically. But one of the wage type names you have justgenerated already exists in table T512W.

System Response
The entry that had an existing wage type name is not created, but allthe other new entries are displayed in the table.

Example
You entered the following:
Wage type begins at 1000
Number of wage types 4
Increase per step 10
However, wage type 1020 already exists, so the system only createsthree new entries in the table on the screen. These are:
Original WT Customizing WT
XXXX 1000
XXXX 1010
XXXX 1030