Unable to use the seeded purchasing value set

Hi, We want to bring the purchasing category as DFF in the negotiation header for one of our reporting requirements. We are trying to use the seeded value set ORA_PO_TAB_CATEGORY_NAME_VS in purchasing. We are getting error, also we tried copying the rule to the purchasing module by using the data type as table and tried attaching the new value set, we are getting the same error for that as well, as shown below.

based on the note id, We used alternative SUBSTR(field,start position[, length ] to pull up to 150 characters f.e. SUBSTR(COLUMN A,0, 150). still it is failing. please advise any workaround or anyone faced this issue