SUMIF based on multiple successive dates

Hi all,

Long-time lurker, first time poster for a problem I'm having trouble solving.

Background:
I have a data-set for a year's worth of productions for some 100 products. I've limited the attachment to 2 months.
The data set contains the date of production, week of production, product code, pcs/pack, type of booking and quantity.
Even though a production run can last for multiple days, system limitations generate a new production order for each day given a distorted overview of the number of production runs and the run size if I use this as a criteria for my sumif and countif formula. If I use the weeknumber as a criteria, I have problems with runs which happen during the transition from one week to the other.
As an added complexity, there are corrections on the production orders output which might happen days later.

Possible workaround:
If there is a product of which there is an output during successive dates, logic determines that this was 1 production run.

• How to code the criteria in the sumifs function to sum up the productions of the same product code of successive dates?
• How to avoid having duplicates using this way of working?
• How to integrate the required corrections on the production orders?

Another approach generating the same results is of course welcome as well, as is pointing me in the right direction with similar questions from the past. (Haven't been able to find them yet)
Hopefully the knowhow here limits the ever increasing bald spot on my head that was creating from scratching my head trying to resolve this issue.

Thanks in advance!