How To Fix V1821 - Do not mix schedule lines with and without purchase order types

SAP Error Message - Details

• Message type: E = Error

• Message class: V1 - Verkaufsbelegbearbeitung

• Message number: 821

• Message text: Do not mix schedule lines with and without purchase order types

What causes this issue?

You have tried to create a schedule line for an item which already has
other schedule lines. These exisiting schedule lines refer to order
type '&V3&'.
The schedule line you just entered has schedule line category '&V1&'.
Order type '&V2&' belongs to this category.
The error message occurred because either order type '&V2&' or '&V3&'
is empty.

How to fix this error?

Change the schedule line categories so that either all or none of the
schedule lines for the item have an order type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message V1821 - Do not mix schedule lines with and without purchase order types ?

  The SAP error message V1821, which states "Do not mix schedule lines with and without purchase order types," typically occurs in the context of sales order processing and scheduling agreements. This error indicates that there is a conflict between schedule lines that are associated with purchase orders and those that are not.
  Cause:
  The error arises when you attempt to process or manage schedule lines in a way that mixes those linked to purchase orders with those that are not. This can happen in various scenarios, such as:
  
  Sales Order Creation: When creating a sales order, if some schedule lines are linked to a purchase order and others are not, SAP will throw this error.
  Delivery Processing: During delivery processing, if you try to deliver items that have different types of schedule lines, the system will not allow it.
  Inconsistent Data: There may be inconsistencies in the data where some items are set up to be delivered against a purchase order while others are not.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Schedule Lines: Check the schedule lines in your sales order or delivery. Ensure that all schedule lines are either linked to a purchase order or not. You cannot mix them.
  
  
  Adjust Sales Order: If you find mixed schedule lines, you may need to adjust the sales order by either:
  
  Removing the schedule lines that are not linked to a purchase order.
  Creating a separate sales order for items that do not have a purchase order.
  
  
  
  Check Configuration: Ensure that your configuration settings in SAP are set up correctly for handling schedule lines and purchase orders. This may involve checking the item category settings and the relevant configuration in the sales and distribution module.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling schedule lines and purchase orders in your version of SAP.
  
  
  Contact Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert who can provide more tailored assistance based on your specific system setup.
  
  
  Related Information:
  
  Item Categories: Different item categories in SAP can have different rules regarding schedule lines and purchase orders. Understanding these can help prevent this error.
  Sales and Distribution (SD) Module: Familiarity with the SD module and its processes can help in troubleshooting and resolving issues related to sales orders and deliveries.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional insights into handling schedule lines and purchase orders.
  
  By following these steps, you should be able to resolve the V1821 error and ensure that your sales order processing runs smoothly.