3613220 - Cannot add newly created data type as a child in existing data type

In a data type of SBPA project, the dropdown of the Type field not displaying all the project data types. 

For example, create a new data type but can not see it in the list of available types when nesting it as a child in another Data type. 

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

• SAP Build Process Automation - SBPA

SAP Build Process Automation, Data Type, New Data Type, Selection Issue, Data Type List , KBA , CA-ML-IPA-DBG-CLS , IRPA Debug - Cloud Studio , Problem