Here is a quick run down of posts for the four counting codes and how they behave in the counting journal.
Manual
https://organicax.com/2016/09/18/counting-group-counting-code-manual/
Period
https://organicax.com/2016/09/18/counting-group-counting-code-period/
Zero in stock
https://organicax.com/2016/09/17/counting-group-counting-code-zero-in-stock/
Minimum
https://organicax.com/2016/09/17/counting-group-counting-code-minimum/
Cheers
Lachlan