SAP Note 21564 - Incorr. length of fld KONTO during batch input MM

Symptom:

During the transfer of a G/L account number for the batch input processing of goods movements (report RM07MMBL or transaction MBBM -> field KONTO in transfer structure BMSEG), the session is terminated with message E00348:
'Field DM07M-KONTO input value is longer than screen field'.

Cause and prerequisites

The incorrect data element 'KONTO' CHAR16 is allocated to field KONTO in structure BMSEG and in test data table T159A.
However, data element 'SAKNR' CHAR10 is allocated to the relevant screen field DM07M-KONTO.

Solution
SE11 -> BMSEG and T159A -> Change
Old: Field name Data elem. Type Length Chk.table Sh.text
KONTO KONTO CHAR 16 Account number
New: Field name Data elem. Type Length Chk.table Sh.text
KONTO SAKNR CHAR 10 Number of G/L account

Please consider: ================
This correction will not be part of the standard system (not even in a later release) since the error only occurs if the posting is to be made to a G/L account other than the one of the automatic account determination during the batch input. In our opinion, this is an exception.
The transfer into the standard system would require an adjustment of all external interface programs.