This thread is resolved. Here is a description of the problem and solution.
I use SKU as a product description so I need to translate it.
I opened wpml-config.xml in woocommerce-multilanguage folder to set
Looking at the product editor, you can see this message: "SKU refers to a Stock-keeping unit, a unique identifier for each distinct product and service that can be purchased."
With WCML, that means you have one product with two names (translations). Therefore we recommend not to use the SKU field as a product description.
You can use other fields for this purpose, even custom fields.
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