SAP Note 12369 - Error in dimension maintenance: Unit missing

Symptom:

Program : SAPMUNIT
Error-ID: BM302
When accessing the dimensions maintenance transaction (OMSC,
pushbutton 'Dimensions') you get the error message BM302
'Internal unit X, language Y is not maintained'.
If you confirm this message with ENTER, the error message BM305
'Unit *** is not created in language Y'.
The dimension concerned is highlighted. The field 'SI unit'
contains '***'.

Cause and prerequisites

In the dimensions table, an SI unit is specified for the highlighted
dimension that is not defined in the units of measure table.
When the unit is displayed on the screen, a conversion exit is
processed automatically. Processing is terminated because the unit
to be converted does not exist. '***' is displayed.

Solution
Call up Transaction OMSC to maintain the unit of measure
for the dimension that was highlighted when the error occur.
To select the dimension, choose F4 using the field next to
the "Units of measure" pushbutton. Then press the pushbutton
"Units of measure".

Create the unit of measure specified in the error message BM302
'Internal unit X, language Y is not maintained". X stands for
the internal unit.
Use the defaulted values as conversion factors. Save the new
unit. Mark the created unit as an SI unit (pushbutton
"Declare SI unit".

Then you should be able to edit both the dimensions and the
units of measure as usual.
If the dimension concerned is only a test dimension (e.g., OZONE),
you should delete both the SI unit created and then the dimension
(first the unit, then the dimension).

Key word: Dimensions