...
Distribution transaction adjustments occur automatically when the system processes distributions. A distribution transaction adjustment occurs when you book a preferred stock transaction as a continuous issuance or a buyback, or when the system cancels a buyback or an issuance. The adjustment occurs only for a continuous issuance, buyback, or cancels because this affects the total amount of shares for the preferred series, and the distribution is based on the total number of shares for the series. Because the booking of preferred shares transactions affects the total value of the preferred shares, the system needs to automatically adjust the distribution amount to account for the change in the total preferred stock value. You can also make a manual adjustment to a preferred shares distribution using the Post Distribution Adjustment panel.
...