3572518 - Unexpected invoice splitting situation

The billing document is unexpectedly split when created with reference to a sales order.

SAP S/4HANA Cloud Public Edition

1. Go to “Create Billing Document” app. (F0798). 
2. Choose one SD Document, click "Create Billing Documents".
3. Appear several TMP invoice in one invoice.

In Display Sales Order app. one sales order has several items. In sales order's item level has a 'Custom Fields' tab.  At the item level of the sales order, there is a 'Custom Fields' tab. The 'Custom Fields' tab has different configurations for different items, resulting in an unexpected invoice splitting situation. 

For example: in the 'Custom Fields' tab, there is a custom field called "Status." Item A for this custom field is labeled 1, item B is labeled 1, and item C is labeled 2. Item A and B will be included in one invoice, while Item C will be in another invoice.

A custom field is created by the customer in the Custom Fields app to meet specific business requirements. To modify/remove this custom field, access the Custom Fields app to make adjustments based on individual needs.

Custom Fields | SAP Help Portal
Custom Fields App and Custom Logic App | SAP Help Portal 

create billing documents, invoice, F0798, customer field, split, sales order , KBA , SD-BIL-IV-2CL , Processing Billing Documents (Public Cloud) , Problem