Hi ,
Both are different and have individal functionality.
WORK FLOW is a tool designed to facilitate and automate the Business process which are not mapped in SAP.
For example release procedures and Approvals will fall under WORK FLOW
where as IDOC is used to send or receive information from or to Legacy system which was mapped to SAP.
IDocs serve as the vehicle for data transfer in SAP's Application Link Enabling
An IDoc can be generated at any point in a transaction process. For example, during a shipping transaction process, an IDoc may be generated that includes the data fields required to print a shipping manifest. After a user performs an SAP transaction, one or more IDocs are generated in the sending database and passed to the ALE communication layer. The communication layer performs a Remote Function Call (RFC), using the port definition and RFC destination specified by the customer model. The IDoc is transmitted to the receiver, which may be an R/3, R/2, or some external system.
Hope it is clear,
cheers,
santosh
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