LSMW classification direct input

Dear Gurus,

I am having an error while updating characteristic value on class 300 (Variants).  With the same template for class 001 (material class) I have succeeded without any error.

The error message is "CLAP_DDB_UPDATE_CLASSIFICATION: exception    24" is only happening for class type 300 only, it made me wonder what have I done wrong.

Please let me know the solution

Regards,

Beto