Dear Redouane B,
one possible solution is to use an 'User-Defined Function' inside the procedure.
Please have a look at the following link to the SAP documentation for Variant Configuration:
Here below, the sample code, again from SAP documentation, concatenating characteristic values. Values are separated by a dash, you can replace it with a space, as needed.
Hope this could help. Feel free to ask here if you need any further assistance.
Thanks and bye,
Flavio
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