This validation rule requires that a conditional formula is satisfied to validate bid submissions.

You can use any of the following methods to construct the formula:

- Click the required attribute, operator, or function buttons.
- Enter attribute, operator, or function names directly into the
**Enter a formula**field. - Copy and paste a formula from another source, such as Excel, into the
**Enter a formula**field.

Note that for this method, the copied functions must also feature in Sourcing Optimizer.

The conditional formula used for validation should evaluate to either 0 or a non-zero number, such as 1.

If the bidder’s submission is correct and passes validation, the formula should evaluate to 0. However, if there is an issue with the bid, and it fails to meet the intended criteria, the formula should return something other than 0; usually 1. This can be done using the **IF()** function. This function takes a condition, a value for when the condition is true, and a value for when the condition is false, in that order.

### Example

If we want to ensure that Total Price, a formula column derived from Price Per Unit and Number of Units, is above 100, we could create a conditional validation rule with the following formula:

`IF( Total Price >= 100, 0, 1)`

You can make conditional validation rules more complex by nesting conditional statements using the IF() function. Instead of setting the true or false values to a number, use the IF() function. This function can contain further IF() functions, if at some point an IF() contains just numerical true and false values.

If we want to set a minimum number of units on lots with the origin, Cork, we could create a conditional validation rule with the following formula:

`IF( Origin="Cork", IF( Number of Units>100, 0, 1), 0)`

If the lot does not have Cork as the origin, the formula evaluates to 0 and passes validation. If the origin is Cork, the formula checks if the number of units is above the threshold, and evaluates to 0 if it is above 100, or 1 if it is not.

To add a conditional validation rule, complete the following steps:

- Go to
**Design > Bid Sheet**. - Click the
**Validation rules**tab. - Click
**Add a rule**. - Enter a rule description in the
**Description**field. **Optional**: In the**Error message**field, enter an error message to be displayed to bidders if their bid doesn’t pass the validation rule.- Click
**Require a condition to be satisfied**. - In the
**Condition rule**area, enter the formula in the**Enter a formula**field, or else use the buttons provided to build your formula. - Click
**Test this formula**to test if your formula is correct. - Click
**Save changes**.