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Answer Posted / alan
EDI is not specific to SAP systems but is exchange of data
between two(or more) systems using ideally accepted message
standards. However these messages can be flat files, XML or
International standards, but the values of data need to be
converted. Necessary for this is some data mapping of
values as the systems may use different values. Normally
there is an external communication service provider and a
mapping tool such as Mercator, Gentran or another
application. There are companies which provide this mapping
service. GXS , Infoaccess etc.,
EDI was in existence before SAP was developed.
ALE is a specific SAP process of 'linking applications'
within SAP. This is done with IDOCS primarily, but can be
converted to flat files or XML depending upon the receiver.
A Purchase Order from one Company code or Plant can be a
Sales process within the other Company Code and plant. The
data is specific to the SAP systems and should only require
table configuration to make any conversions with IDOCS. A
Purchase process would treat the other Company code or
plant as a Vendor (Purchase Order), whilst the receiving
Company Code or Plant would treat the sender as a Customer
(Sales Order). See inter company transfers of Stock within
SAP.
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