i try to import variants in my products by a excel document. I export my variants and give me a clear referense because i made some manually.
it needs internal id, name, value of attribute, price, cost...etc.

one record is like this
aa, cabecera, Tamano: Individual, 0.00, 0.00,....
each coma its a cell in excel.
i edit my excel of my export and place some values, for example 3784.48 for the price, and delete the older ones in odoo.

i use the import button and show the values correctly. when i test it show me that the attribute values don't exist, if i check the "create if dont exist" give me the  alert 

current transaction is aborted, commands ignored until end of transaction block

why this happen and had solution?