2416813 - Custom String Field Not Available for Concatenation in Business Rule

The custom-string field associated with picklist configured in Manage Business Configuration is not available in substring and concatenate functions.

"Image / Data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental" 

SAP SuccessFactors Employee Central: Business Rules

Concantenate(), concatenation, business rule, custom-string field, picklist field, Generic Object, Foundation object, field not available, No results, No data. , KBA , LOD-SF-EC-JOB-RUL , Job Info Business Rules , LOD-SF-EC , Employee Central , Problem