SAP Message 60708 - & enter maximum one condition type of category &

Diagnosis
You have entered more than one condition type of the above-mentionedcategory.
However, it is specified in Customizing that only one condition type ofthis category may exist.

System Response
The system does not accept your entry.

Procedure
Correct your error by deleting the category condition types you do notrequire.
If necessary, you can also have your system administrator check theCustomizing.

Procedure for the system administrator
Check and correct the settings for the condition types and categoriesin Customizing as required.