BW - Delta for Master data not loading

Hello All,

I am not able to load delta for master data of vendor and material.

The initial load works fine but when I load delta it gives an error

" The extraction program does not support object 0vendor"

" ALE change pointers are not set up correctly"

Do i need to activate the change pointer in BD61. I was not sure so checking up with all experts.

Regards

Vanya