SEED assignment (MEGAN5)

For me it is not clear how MEGAN assign the SEED classes to the sequences. In the manual, it says that it is made throughtout the identification of RefSeq id (accession number?). 

When I load my blast file using the builtin refseq map, none of the sequences gets an assignment... The taxonomic identification works...

The basic format of my blast file is like that:

01contig00001_567_4372_+    gi|495059216|ref|WP_007784050.1|    56.09    624    262    7    348    967    5    620    0.0     711    Brevibacillus sp. CF112

Any light on this problem?

Thanks in advance!