Significance of a field docln of table bseg added in ECC table.

Hi,

Our system has been upgraded from 4.6 to ECC.

In Bseg table, a new field docln is added in this version.

Currently tha value '#' has been populated in this field for all existing documents.

So while trying to open in FB02 , giving me dump at ststement of unpacking.

But no problem in posting new documents with FB01, and opening with FB02. And value populated are blank.

How can i know the purpose of this field and how it is populated or from where it will be mapped or calculated?

I have tried to see the documentation, it says not available in EN.

Pleas help with your valuable suggstions.

Thanks

Salini.