The documentation for ESAP 6.3 version 2.5 in English can be downloaded here.
The following document gives a brief description of ESAP 6.3.
» Scenario ESAP 6.3 ver 2.50 in english
The following zip-file contains the business document specifications (AT) and message specifications (MS) of ESAP 6.3.
» ESAP 6.3 ver 2.40 in english
The business document specifications are exact specifications of the content of the business documents. The message specifications define how the elements of the business documents are mapped to EDIFACT/EANCOM messages.