3603837 - "No suitable value help key field exists" when trying to change the Value Help View of a Custom Field

You have created a Custom Field of type "Code List based on CDS View". Now you want to change the Value Help View and you're getting the error message "No suitable value help key field exists" when selecting the new Value Help View. 

SAP S/4HANA Cloud Public Edition

1. Go to Custom Fields application
2. Open the Custom Field of type "Code List Based on CDS View" 
3. Click on the value help on the field "Value Help View" to choose the new view
4. Choose the new CDS View 
5. Error message will appear with a red flag

The Custom CDS View that you're selecting has a different number of Key Fields when comparing to the old Value Help View OR it has the same amount of Key Fields but they have different data type and/or length. 

You can change the value help view that you selected even after you've published your custom field. However, that the number of key fields, their data type, and their length have to be kept stable.

Therefore, ensure that this rule is being followed or create a new Custom Field to achieve your requirement. 

For more information, check the following documentation: Creating a Field of the Type Code List Based on CDS View: Example

custom field, value help, code list, based on, cds view, custom cds view, key field, length, value, type, amount, data, not suitable  , KBA , BC-SRV-APS-EXT-FLD , Custom Fields , Problem