Error creating counting rule

Hi experts!

When I try to create a new counting rule I get this error:

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Entry 3 02 A does not exist in T556R (check entry)

Message no. 00058

Diagnosis

Input values must be defined in Table T556R. The value or values '3 02

A' are not specified in this table.

Procedure

Check whether the input is correct and correct if necessary.

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What do I need to do to solve this error?

Kind regards,

Julian.