3559903 - Error "Please enter a valid start date" displayed when default value rule triggers in SAP Cloud for Customer

• A default value rule is set via Adaptation mode to change a field of the "Date/Time" type.
• When this rule is triggered, the error "Please enter a valid start date; is no valid format." or similar is shown.
• If the document is saved, the Date may go to 01.01.1970 - this is the Date 

SAP Cloud for Customer

1. Configure a default value rule for a "Date/Time" field using Adaptation mode.
2. Trigger the rule.
3. Observe the error message "Please enter a valid start date" or similar.
4. Save the document and check if the date defaults to
   
   

• The error typically occurs due to a rule configured for a "Date/Time" field.
• The calculated value results in an invalid date or a date in the past, often caused by unsupported arithmetic operations. 

1. Review the rule logic thoroughly for any errors in the calculation.
2. 2. Ensure the calculated value does not result in an invalid or past date.
3. 3. Avoid using arithmetic operations for "Date/Time" fields as they are not supported in the rule editor. 

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