There were freshers in my team who wanted to work on sender IDOC adapter. They were searching SDN for step by step guide on ALE configurations for triggering idocs out of SAP. Hence, thought of bloging this on SDN so that it can act as a guide/checklist for XI consultants.
All the configuration specified below are to be performed in the Sender SAP system
• Create a Logical system for the sender SAP system and the receiving XI system using Transaction - ‘SALE’: 
• Assign Client to the Sender Logical System 
• Create RFC destination of type ‘3’ for SAP XI system using transaction – SM59:
Make sure that the name of the RFC destination and Logical system for SAP XI is the same. 
• Create a Distribution Model through ‘SALE’ transaction: 
• Create a Distribution Model by selecting ‘Create Model View’:
Specify the name of the model view and a description. 
• For the model view created above, add the message type of the idoc that you wish to send to SAP XI using this model view. Select ‘Add Message Type’ option and then specify the sender logical system and the receiver logical system. 
Save your Model view before proceeding further.
• Generate the partner profiles by selecting the navigation path from the main menu, Environment --> Generate Partner profiles
Upon selecting the generate partner profiles option, then execute it with the default parameters displayed on the selection screen 
• From the main screen navigate through the menu option, EDIT --> MODEL VIEW --> DISTRIBUTE. Upon receiving the message shown here, it means the distribution is successful 
• Go to transaction BD10 to send a material out of IDES: 
• Go to transaction WE02/WE05 to check the status of the IDOC in the sendign system 
ALE configuration for pushing idocs from SAP to XI
