BDCPV is not updating for custom object

Hi All,

I am trying to capture J_3ABOMD (MENGE)changes through change pointers but unfortunately its not working. For my custom message type other than this table all other field changes related to STKO and STPO changes working fine. Not sure what am i missing, i created custom object for BD52 since i did not find standard one. Could any one look in to this.

Thanks