I am not on a system today, but I see that your BGR00 structure is totally without field mapping.
Make the fields visible, select from menu Extras > Layout. You get then a pop-up to define the layout
I prefer and recommend to set each field in the layout active
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(more infos on preparing the LSMW in my blog LSMW Material master by BAPI method - Part 1 )
As said I am not on system and cannot verify my answer, hence I recommend to check existing records in the condition tables, as I think the field BKOND2-VAKEY must not be without content