SAP Message C5026 - Enter a valid downtime element

Diagnosis
The key word of the user field contains the string "(DT)". This meansthat the field is to be used for entering a downtime element. The valueyou entered, however, is no downtime element.

Procedure
Enter a valid downtime element.
In the standard system, this entry is used to determine default valuesfor the downtime elements SETUP and TEARDOWN. Phases to which one ofthese downtime elements has been assigned in this field are taken intoaccount when the default values for this downtime element aredetermined.