Thank you for the response,
We have used this technique to create and assign concepts to the images, works fine.
imagen_resultado = app.inputs.bulk_merge_concepts([imagen.input_id], [[(concepto,True)]])
Problem is that, the concepts that are created are not associated with any model, therefore when we try to use the concept we get this error. Also we cant find a way to Associate a Concept with a model.
Thanks in advance for your help