Story

As a user, I would like the current on hand recorded in the system when a count of any type is started

Details

The goal of this update is to create a record of the system on hand for each item in a count at the time a count is created. Once we have this data recorded we can use it to recalculate the system on hand when a count is applied.

To do this, we will subtract the on hand snapshot from the system on hand at the time the count is applied. This will provide us with the depletion that occurred while the count was in the draft state.

We can then subtract the depletion from the count values that the user entered. This final calculated on hand value should be more accurate than the user entered value on its own.

This will help us to account for operators who prefer to review employee counts before they are submitted.

AC

1. Each time a new count is created a snapshot of the system on hand value for each item is recorded and saved in the draft count record.
2. When the user applies a count, the on-hand values for all items in the count are recalculated based on the formula below:
   1. Calculated On Hand equals the User Counted Value minus item depletion while the count was in the draft state.
      1. To find the depletion, subtract the on hand snapshot that was recorded when the count was started from the system on hand at the time the count is applied.
3. If the user does not manually update the value of an item in the count, the system omits the User Counted Value from the equation to find the Calculated on Hand when the count is applied.
   1. In this case we subtract the on hand snapshot recorded at count creation from the system on hand at the time the count applied to find the new calculated on hand for an item.