It is initialized:
From this field, it is possible to directly enter the group customer whose existence is controlled in the customer table or to use the contextual button to:
It is possible to search a customer or several customer grouped under the same criteria by selecting "Quick customer search". A list of matching items is generated on tabulating to the next field.
For a more advanced search, all fields present in the block can be entered. The list of matches is narrowed down with each tabulation.