3667797 - Substitution of Payment Reference Field (BSEG-KIDNO) Not Working During Document Posting

• The Payment Reference field (BSEG-KIDNO) cannot be substituted during accounting document creation from billing in SAP S/4HANA Cloud Public Edition. 
• Standard configuration tools such as BAdI FIN_ACDOC_ITEM_SUBSTITUTION and Manage Substitution and Validation Rules do not support substitution of this field. 
• The system automatically populates the Payment Reference field with a predefined standard value, and external values cannot be applied. 

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