Extended Datasource - missing data

Hi Y'all;

I have extended the 2LIS_11_VAITM datasource with a field that I fill in the user exit.

When I run RSA3 in R3, the field is filled with data.

When I run the infopackage in BW, the field is empty in the PSA and, therefore, in my 0SD_C03 cube.

I've debugged the transfer rules and the field is empty in the l_t_appl table.

Can anyone point me in the right direction?

Regards

Jim