SE11 > Display Data element RODMUPDMOD > Documentation:
' Y':The record is an update image.
This kind of record is used in the change log of a Data Store object in order to save the value from the update. This is for a possible rollback and roll- forward for key figures with minimum or maximum aggregation. This record also has the update value for characteristics (in this case, it is the same as the after image).
Null values are stored for key figures with totals aggregation. An update image is only required when the value from the update is smaller or larger than the before image for at least one key figure with minimum or maximum aggregation.
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