How to 'slightly' modify SOOrderEntry.InvoiceOrder?

@ddunn Try using a flag to condition the execution of the additional logic you would like to add when overriding the InvoiceOrder method as follows:

public class yourExtension : PXCacheExtension<SOOrderEntry>{
public bool runCustomCode = false;

public void delegate InvoiceOrderDelegate(Dictionary<string, object> parameters, IEnumerable<SOOrder> list, InvoiceList created, bool isMassProcess, PXQuickProcess.ActionFlow quickProcessFlow);

[PXOverride]
public void InvoiceOrder(Dictionary<string, object> parameters, IEnumerable<SOOrder> list, InvoiceList created, bool isMassProcess, PXQuickProcess.ActionFlow quickProcessFlow, InvoiceOrderDelegate baseMethod){

   baseMethod(parameters, list, crated, isMassProcess, quickProcessFlow);
   if(runCustomCode){
   //yor code
   }

}

[PXButton]
public void YourButton(){
try{
   runCustomCode = true;
   Base.InvoiceOrder(...);
 }
finally{
  runCustomCode = false;
}
}

Thank you for sharing your solution with the community @ddunn !