This is the window that is displayed when you press the Adjust button on the Till Balancing screen.

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The fields are as follows:
Date - the date of the adjustment
Description - the reason for the adjustment (the default is shown above)
Amount - the amount
Credit - tick this box if this is a credit. If the amount of actual cash in the tin is more than is shown on the Till Balance Report, then leave the box unticked. If the amount of actual cash is less, then tick the box.

The buttons have their normal meanings.