[13.0][FIX] fix migration with product with twice the same attribute #2488
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Description of the issue/feature this PR addresses:
For some product you can have twice the same attribute
Example you have a bi-color product you can set
attribute line 1: color => white, black, yellow
attribute line 2: color => green, blue, yellow
if both attribute line have same value for the color it's a litle more
complexe to fill the value as you have two product_template_attribute_value
with the same attribute_value "yellow"
Current behavior before PR:
Migration fail
Desired behavior after PR is merged:
Migration work
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