This is a severe usability issue about interoperability between scalc and 
swriter:
you select a range of cells in calc, if you paste them in swriter you get a 
scalc embedded object (this is normal) if you paste special as html you get a 
new swriter table.
If you paste in an existing swriter table it's impossible to get the cells 
copied in the appropriate cells. (I tried any combination)
This is a normal activity that my users (80 users previously using MS Office) 
were doing all the time with the MS suite. 
I have explained them to copy in a white space, selecting the cells from the 
newly created table and paste in the existing table and delete the temporary 
table as a workaround but they are complaining it's a rather cucumbersome 
process (I personally agree).
Several of them are pressing our management (convinced by me to adopt OOo) to 
go back to MS Office. 
I have people doing this kind of activity 5 hours a day when compiling reports, 
they are really unhappy about my choice. 
Best regards