EDI Tcodes

WEDI - Area menu for EDI relavant tcodes

WE05 - Idoc List
WE19 -  Test tool for Idoc processing - you can run FM in foreground and debug (take an existing idoc and run it)
WE09 - Search Idocs for Business content (you can search for a field value) - You can change field values here and save (which then can be reprocessed using BD87/84)

WE20 - Partner profiles
WE60 - Mapping Structures/Documentation 

WE21 - Ports definition in Idoc processing  (setup SAPPI_PRD port here )

SALE - Idoc Interface ALE settings (setup distribution model, logical sys etc here)

WE30 - Develop idoc types
WE31 - Develop idoc segments

WE57 - To setup FM <-> Message type assignment
WE41/WE42 - Process codes

BD84 - Reprocess Idocs
BD87 - Status monitor

RSEOUT00 - Process all Selected Idocs (for Partner) - This way you can collect all Idocs for a partner and send them at a time.

VOE2 - To map customer to Sales area and Order type
VOE4 - To map customer ship-to (external) with internal number  (We dont want our customer to remember all the ship-to numbers.. do we?)

IDOC -  Idoc and EDI basis

Vendor to Us(our comp) mapping (for INVOIC type - vend invoice):
OBCA - Map vendor company code to our real company code
OBCD - Map External tax rate to Tax code
OBCE - EDI INVOIC Programming parameters