The Inventory Open Price toggle field, when turned ON, allows anyone in the Sales Manager to edit the line item Price of the item (the Edit Line Item Price security level is NOT checked). The Open Price: toggle field is automatically added to the More Data Inventory Database Screen as long as the screen is similar to the default (shipped) screen.
Note: The Not Discountable field is also ignored as far as checking the Edit Line Item Price of Non Discountable Items security level, but it still functions for telling Keystroke to not automatically prompt for the price to be entered..
See:
Inventory Database - More Data Screen Fields