How To Fix M7420 - Place the cursor on the line number to change the serial number entered

M7420 - Overview

• Message type: E = Error

• Message class: M7 - Inventory Management and Physical Inventory

• Message number: 420

• Message text: Place the cursor on the line number to change the serial number entered

What causes this issue?

To change the serial numbers entered, you have to place the cursor on
the line number first.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

M7420 - Details

• The SAP error message M7420, which states "Place the cursor on the line number to change the serial number entered," typically occurs in the context of inventory management or when dealing with materials that have serial numbers. This error indicates that the system expects you to modify the serial number for a specific line item in a transaction, but the cursor is not positioned correctly.
  
  Cause:
  
  Incorrect Cursor Position: The most common cause of this error is that the cursor is not placed on the line item where the serial number needs to be changed. The system requires you to select the specific line to make changes.
  Missing Serial Number: If a serial number is required for a material and it has not been entered, this error may also appear.
  Data Entry Error: There may be an issue with how the serial number was entered, such as incorrect formatting or invalid characters.
  
  
  Solution:
  
  Position the Cursor