What happens when select single is not allowed in the LOOP
Examples: Materials are available at a variety of prices and have expiry dates

this part of the first I contact processing, was conducted in DSO itself in a transformation:
first result_package according to the actual delivery date to heavy, and then for the first and the last one, make sure the date range of package
based on the above date range to need to get the data in the table
then LOOP itself, try to reduce data after
LOOP itself, split the date range a a

This approach requires setting up semantic groups
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