3313434 - Some fields related to sales order cannot be displayed in ORDER_DATA_LIST

Some fields(e.g. customer reference) related to sales order are added to production order output template PP_MOR_DATA_LIST.
For some sales order, the data can be displayed. For others, no data is displayed in the field. 

SAP S/4HANA Cloud

In Data Source Extensions for FDP_PP_MOR_DATA_LIST_SRV,  when adding new fields from Sales Order node,  it will only retrieve the data for sales orders whose SD Document Category is 'C' (Order).  If the SD document category is others, the data cannot be fetched. 
e.g. 

Add fields from another data source (Sales document) instead.

e.g. 

ORDER_DATA_LIST, PP_MOR_DATA_LIST, sales order, customer reference, production order, FDP_PP_MOR_DATA_LIST_SRV , KBA , PP-SFC-EXE-PRINT-2CL , Order Printing (Public Cloud) , Problem

SAP S/4HANA Cloud Public Edition all versions ; SAP S/4HANA Cloud all versions