Did you maintian the reminders data in the mateiral master purchaisng tab?
follow the info below
If you have specified reminder levels under the item details of a purchasing document, the system is able to generate reminders and urging letters (expediters) automatically.
You can enter up to three reminder levels. For example, the reminder levels 10-20-30 mean that urging letters are issued 10, 20, and 30 days after the due date for submission of a quotation or for the delivery of ordered goods. (Note: in the SAP System the term "reminders" is often used to denote such messages issued before the due date, whereas the term "urging letter" or "expediter" commonly stands for a perhaps more strongly worded admonitory message issued after the due date. However, this distinction is not consistent, and may not apply outside the SAP environment. The corresponding term for "urging letter" in the FI component is "dunning letter", and relates to overdue payments.)
A negative number means that a reminder is to be issued prior to the deadline for submission of quotations or the delivery date for ordered goods. For example, if you enter 5- as the reminder level, a reminder will be sent 5 days prior to the quotation submission date.
Prerequisites
The message determination facility has been set up in Customizing for Purchasing.
You can also work with the standard settings. For further information, see Tips for Fast Message Determination Set-Up in the Implementation Guide (IMG).
Message records must have been created through master data maintenance (Purchasing menu).
The purchasing document involved must have previously been transmitted to the vendor.
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