DTP from PSA-> InfoCube Problem

I am going to reformulate my problem..maybe so have more luck here...

I am using a Delta approach to extract from DataSource to BW... I see on the PSA table( context menu on the DataSource) that the initialization and deltas are there... but on the <i>request update</i> field says <b>request no updated in any datatarget</b>.

I have created a DTP to copy from here in my InfoCube...but defining the DTP I am not able to select the PSA table instead of that it listed only the DataSource on the Source system... and says no direct update possible because there is a delta involved....

well ..going to appreciate any idea

FedeX