This question is asked by Dr. Lin.

Issue

For example, settype COM_COMMERCIAL could be opened via tcode COMM_ATTRSET:

However COMM_PRFREEATTR could not be opened:

The error message is raised in line 48:

Compare the variable value for success case COM_COMMERCIAL:

Root cause is, the correct settype and persistence table name should be COMM_PRFREEATTR, unfortunately, when you enter tcode COMM_ATTRSET, the last character R of name is truncated:

Workaround

Manually add the missing R in debugger:

After that the settype could be opened in transaction code.

The set type was not created using the Maintain Set Types and Attributes transaction in the product master (COMM_ATTRSET), or it is a standard SAP set type that was created manually (not generated).
Make your changes using the transaction originally used to create
the set type. Standard SAP set types that were created manually cannot be displayed using a set type transaction as the COMC_SETTYP_ATTR
entries required to do this do not exist.
The following settypes cannot be displayed in transaction
COMM_ATTRSET. The following settype haven't been created by the
generation tool of transaction COMM_ATTRSET but they are manually
created. At that time the generation tool development was under way.
This settypes have no entry in COMC_SETTYP_ATTR. So we don't allow to
display them in COMM_ATTRSET:
COMM_PR_CONFIG, CRMM_PR_REFOBJ, COMM_PR_MAT, CRMM_PR_TAX,
CRMM_PR_SALESG, CRMM_PR_SALESA, COMM_PR_SRV, COMM_PR_UNIT,
COMM_PR_SHTEXT, COMM_PR_LGTEXT, CRMM_PR_SALESH, CRMM_PR_BTR,
CRMM_PR_SRVRR, CRMM_PR_SRVDUR, COMM_PR_GTIN, CRM_CAT_SAL, CRM_CAT_PUR,
COMM_PR_COND, COMM_PROD_VAR, COMM_PR_CM, COMM_PR_STATUS.

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