Formula versions - validity dates
Correct, if only one formula version is active & approved, you can disregard the from / to date.
If you would like to have multiple active & approved formula versions, you can do so as long as they are unique combinations of:
-From / To date (non overlapping)
-From formula size
-Site
This is useful if you have two different formulas based on batch size. IE From formula size 1 is run on a smaller mixer, and from formula size 10,000 is run on a larger mixer that has a slightly different set of ingredients required.