SAP Message 54304 - Cannot copy & to & because & exists in CWType area

Diagnosis
You chose automatic assignment of a customizing wage type andthen entered the two parameters to create several copies of a modelwage type. But one of the wage type names you have just generatedalready exists in the CWType field shown on thescreen.

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, an entry already exists on the screen for the wage type youwant to copy as 1020. In this case, only three new entries are createdin the table on the screen. These are:
OWType CWType
XXXX 1000
XXXX 1010
XXXX 1030