1. Create a writer document and insert a table. Copy the table to the clipboard;
2. Create a calc document and select some cells;
3. Ctrl-V.

The position of the pasted table depends on the way you select cells.

if you drag mouse from up-left to bottom-right, the table will start with the 
bottom-right cornner of the selected area. 
If you drag mouse from up-right to bottom-left, the table will start with the 
bottom-left cornner of the selected area.

That is to say, the reference point is always the position we release the 
mouse. The reference point should fixed to the left-up cornner of the selected 
area if there is a selected area.