Mode field is incorrectly maintained. Permitted values: I,O

What causes this issue?

The MODE field in the transferred record has been incorrectly
maintained.
Valid values are:
I,,-- ,, for global insertion of all records
O,,-- ,, for overwriting of all records


&SYSTEM_RESPONSE& (EDT only)
The system places the relevant record in the batch input session for
correction and subsequent reimportation. Note that with this transfer,
all of the maintained MODE fields must have the same value.
Alternatively, you can leave the MODE fields empty in all records but
one.


&WHAT_TO_DO& (EDT only)
Correct the record in the batch input session.


&HINTS&

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

Error message extract from SAP system. Copyright SAP SE.