WEDI is an SAP area menu which list all the relevant SAP transaction codes related to Idoc and EDI

@WE02 - Display IDoc
@WE21 - Port definition
@SM59 - RFC destination
@WE46 - IDoc administration

Find IDOC's
@WE06 - Active Monitoring
@WE07 - IDoc statistics
@WE09 - In database
@WE10 - In archive

Display Status
@SM58 - Transactional RFC
@WE08 - File Interface
@WECP - CPIC interface

IDOC Testing tcodes + IDOC Processing
@WE19 - Test tool
@WE15 - Outbound from MC
@WE14 - Outbound Processing from IDoc
@WE18 - Create Status File
@WE17 - Process Status File
@WE12 - Modified Outbound File, Inbound
@WE16 - Original Inbound File, Inbound

Documentation tcodes
@WE60 - IDoc types
@WE64 - Process Codes

IDOC development transactions
@WE31 - IDoc segments
@WE30 - IDoc types
@WE81 - Message types
@WE82 - IDoc Type/Message

Outbound Processing settings
@WE41 - Outbound Process Code

Inbound Processing settings
@BD51 - ALE Attributes
@WE57 - Message/application object
@WE42 - Inbound process code

IdocControl
@WE55 - Create File Name
@WE34 - IDoc Styles
@WE32 - IDoc views

control status
@WE47 - Define Status Values
@WELI - Define Status Groups
@WE43 - Display status record

Partner Profile control
@WE24 - Outbound Proposals
@WE27 - Inbound Proposals
@WE44 - Partner Types
@WE45 - Forward inbound

How to access SAP WEDI area menu tcode

WEDI is an SAP area menu and although it is not an executable transaction you kind of do trigger it the same as one, by typing WEDI into the command box. Note if you use /Nwedi you will get and error but /Owedi will actually work.

Step 1 - Execute WEDI transaction code

Step 2 - View WEDI area menu

Step 3 - Expand WEDI area menu nodes

Step 4

If you can't see the actual transaction code in the sap screen, you need to turn it on in settings

Step 5

Video showing the WEDI t-code

This video shows some of the functionality you can access within the SAP WEDI transaction code

https://youtu.be/cP6TfUHpb7M