Diagnosis
The required operation is not possible with the DataSource specified.Check the status of the DataSource in the source system. The followingrestrictions apply:

• DataSources cannot be read with full update if

They have not been generated
An update is running

• DataSources cannot be read with delta update if

They have not been generated
An update is running
The last update failed
The DataSource has been invalidated because of assignment changes inOLTP.

Procedure
If an update was running, try to carry out the operation again later.If the DataSource could no longer be read because the last updatefailed or the DataSource had been invalidated, you have to start a newfull update.