>>However, I read some documentation in the meantime and I think I've found the answer to this problem. The Microsoft Docs say that the cursor created with SPT technique can not be associated with controls in a form and the such cursors are readonly (quite naturally, if you think about the fact that it is generated by an SQL statement). Only way you can update the backend database through the use of this kind of cursors is though the UPDATE SQL statement where you'll have to use: SET = some value etc.
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>Is there a reason you are not using a remote view? What you want to do (update the cursor) is handled automatically with views.

Eric:

Thanks for your input. I knew and I have been using remote views for the task described. However, I wanted to test SPT capabilities in data entry and find out what is involved in using it.