While changing Partner number, VBA code keeps running while interacting with SAP system

The best possible solution to avoid this issue is by adding breakpoints to the appropriate places in your code. This issue is common with VBA and C# while debugging code that includes COM libraries, particularly when interacting with SAP systems.

Understanding the Problem

When changing partner numbers in SAP through VBA automation, the code may continue executing even while the SAP system is still processing. This occurs because VBA doesn't automatically wait for SAP's COM interface to complete its operations before moving to the next line of code.

Solution Implementation

Here's how to properly handle this situation using breakpoints and wait mechanisms ?

Example

VBA code with proper breakpoints and wait logic ?

Sub ChangePartnerNumber()
    Dim SapApp As Object
    Dim Connection As Object
    Dim Session As Object
    
    ' Connect to SAP
    Set SapApp = GetObject("SAPGUI")
    Set Connection = SapApp.Children(0)
    Set Session = Connection.Children(0)
    
    ' Change partner number
    Session.findById("wnd[0]/usr/ctxtPartnerField").Text = "12345"
    
    ' Add breakpoint here - Allow SAP to process the change
    Session.findById("wnd[0]").sendVKey 0  ' Enter key
    
    ' Wait for SAP system response
    Do While Session.Info.Transaction = ""
        DoEvents
        Application.Wait DateAdd("s", 1, Now)
    Loop
    
    ' Continue with next operations only after SAP responds
    Debug.Print "Partner number changed successfully"
End Sub

Best Practices

To prevent code execution issues when working with SAP COM libraries ?

• Place strategic breakpoints after each SAP interaction
• Use DoEvents to allow SAP to process requests
• Implement wait loops to check SAP system status
• Add error handling for timeout scenarios

Conclusion

Strategic placement of breakpoints and proper wait mechanisms ensure your VBA code synchronizes correctly with SAP system responses, preventing execution conflicts during partner number changes.