Import of related products data

Hi,

I have just been updating our site, in particular with new 'related products'.
We several hundred of these to do so I created an import file and, just for convenience, organised it with a format similar to the simplified one below:

product_code,related
xxTest_Product_Top2,TD_2180058
xxTest_Product_Top2,TD_2214419

Although the above import correctly attaches both related products to the main product, it completely erases pretty much everything else, including:

The product name
The product description
The product category
The product image
etc etc

However,the following format works fine, keeping all the other product information intact:

product_code,related
xxTest_Product_Top2,TD_2180058;TD_2214419

I have used related product imports before but each line has started with a new product code, not a repeat of the same product code. That type of import also works fine.
The problem seems to be where the product code is a repeat of the line that precedes it. It behaves the same whether the import is from CSV or from the text area.

Regards
PhilP

OK Nicolas - thanks.
Now I know, I can work with it.
It would be useful to have a warning about this in the user documentation the next time you update it.
Regards
PhilP