This default value is taken from the customer register, but can be temporarily modified for a particular quote. The validity periods must be registered in the Terms and Conditions procedure in Global Settings module. The information entered in this field will be printed as “Validity period” on the quote.
If you enter 0 in this field you can enter a value in number of days. This value is then used to calculate a valid through date. The valid through date will be printed on the form under the Valid through heading as usual.