If the contract applies to one particular part, this part is displayed in the Part field. In this case, the Part group field will be empty. If the contract applies to a part group, the Part field will be empty, and the Part group field will contain the part group.

This is the start date of the contract.

This is the last day on which the contract is valid. After this date, the contract will be invalid and can no longer be used for new purchase requirements and purchase orders.

This field shows whether the contract is based on the quantity of parts to be purchased, or on the sum of the parts to be purchased. Depending on the contract basis, enter a quantity and unit, or a sum.

If the contract basis is 'Quantity', enter the unit and the quantity as laid down in the contract. These values are displayed on the General tab and on the Contract tab. They can only be changed on the General tab.

If the contract basis is 'Sum', enter the sum laid down in the contract. This value is displayed on the General tab and on the Contract tab. It can only be changed on the General tab.

Select this check box if the contract is no longer valid. If this check box is selected, the contract can no longer be used on a purchase requirement or purchase order.

Use the Calculation unit field to specify the unit the price applies to. You can choose from the following options:

Unit	This is the stock unit that has been set on the General tab of the Parts form.
Weight	Kilograms
Surface area	Square meters
Purchase unit	This is the purchase unit set on the Purchase tab of the Parts form. This option is only available for the calculation unit for the purchase price.
Sales unit	This is the sales unit set on the Sales tab of the Parts form. This option is only available for the calculation unit for the sales price.

In the Calculation quantity field, specify the number of calculation units to which the price applies. To specify a price per 100 kg, for example, choose 'Weight' in the Calculation unit field, and then enter '100' in the Calculation quantity field.

This is the currency in which the price was agreed for this purchase contract.

This is the price for the part as laid down in the contract. If you enter the contract on a purchase requirement or purchase order, this purchase price will automatically be used on the purchase requirement or purchase order. As it is a price that was contractually agreed, the price cannot be changed there.

Enter a discount percentage, if applicable. Isah will calculate the discount sum on the purchase price. The purchase price less the discount will appear in the Net purchase price field.

To enter a surcharge, enter a negative discount percentage.

Scripts allow you to perform a range of calculations. If, for example, the purchase price agreed in the contract depends on a number of variables, the part price may vary by purchase requirement or purchase order. This variable price can be calculated automatically using a script. Once the script has been set, the contract price for each purchase requirement or purchase order will be calculated automatically.