Not archived some document number for MM_MATBEL archiving object

Hi,

I am archiving MKPF and MSEG tables data through MM_MATBEL archiving object,Here i have archived some document numbers only,and remaining document numbers are not archived,don't know the reason.

The document numbers which are not archived having Movement type and storage types are...

For example:

Document Number               Movement type                         Storage location      Storage type

4900000000                               561(Init.entry of stBal).            STOK                   998( Init. Entry of Inv. Data)

and also some other movement types and storage types are not archived.What is the reason for that.

Thanks