Diagnosis
The expression '&V1&' was specified as a reference point for thedeadline calculation for activity no. &V3&. This expression eithercontains no (valid) date or no time or contains an error and thereforecannot be evaluated.
Note: The internal ABAP type of the expression was &V2&, its contentV4.

System Response
For the deadlines "latest end, desired start, latest start, desiredend" a warning is logged and a work item is created without thesedeadlines.

Procedure
Check the expression concerned in the workflow definition and ensurethat its value is a correct date or a time.
If a work item has been created without (a) deadline(s), you can setthis/these subsequently.