Update mode changed directly from delta -> Note long text

What causes this issue?

You have changed the update mode to Delta Direct. Make sure that a
significantly higher number of entries are generated in the BW delta
queue (see <DS:TRAN.RSA7>Maintenance of the BW Delta Queue</>).

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

It is sometimes necessary to load data into the BW more frequently than
once a day (but not more often than once every hour).
Note the following special features for the setup of data sources for
the BW:
After the setup run in the OLTP system, at least one successful
initialization request must exist for each data source before document
changes are made. Otherwise, the delta information will be irrevocably
lost.
<ZH>Important Note</>:
Before transporting customizing requests to change the update mode in
other systems, <ZH>check</> that all V3 update entries for the function
module MCEX_UPDATE_&V1&* in these systems have the status "Ok" or
"Update Completed". You can check this in the target system in the
update overview (transaction SM13).
Otherwise, the old delta information is no longer transferred
automatically into the BW after the update mode has been changed.

Error message extract from SAP system. Copyright SAP SE.