Movement Type copy error

Hi Gurus,

When i created the new movement type for good issue(loss) from copiny 551 to z51,i am getting the following Error...

"Entry Z51 does not exist in TSTC - check your entry

Message no. 00058

Diagnosis

Input values must be defined in Table TSTC. The value or values 'Z51 ' are not specified in this table.

Procedure

Check whether the input is correct and correct if necessary.

Procedure for System Administration

If this is not an incorrect entry, check the system settings and change them if necessary.

If there is a connection to the Customizing system, you can maintain the system settings by choosing Customizing in the Performance Assistant or Maintain Entries (F5) when displaying the help in a modal dialog box."

Thanks in advance.