The customizable button is useful when we want to use and external application by sending data from the EMDI

#DID   Document number
#REL   Related documents
#CID   Customer ID
#CAA  Customer database “Aa”
#DAA  Document database “Aa”

By clicking the key and if you define a website,then EMDI will send the documents:

By calling a specific program 2 variables is sent:

  1. Line number of Sales
  2. Line number of Client

eg:

To what you call it is defined on the Settings->Sales/Purchases->Key general use