Condition Table Functioning Query !!

Dear All

EG:

If I take standard condition table 5 , customer/ material.

When I see fields in access Sequence it shows KUNNR, MATNR, VKORG and VTWEG.

but When i create own customized condition table say 620, customer / master

then The fields in access sequence show only KUNNR, MATNR.

Can anyone highlight why system behaves differently in customization ?

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Regards

Pavan Kumar