SAP WE19

It is the IDoc test tool, letting you create, edit and re-send a test IDoc (often based on an existing one) to test inbound processing and troubleshoot mappings.

• Template: an existing IDoc or a basic type.
• Editable data segments (change field values).
• Inbound function-module test (simulate posting).
• Outbound send test.

• Copy a failed IDoc, correct data, and re-test inbound processing.
• Use it to test configuration/mapping changes safely.
• Check the resulting status/application document.

• Test IDoc still fails, the underlying data/config issue remains.
• Confusing test with reprocessing real IDocs (use BD87 for that).
• Sending test IDocs to a real partner/system by mistake.

• Testing inbound with the function module and believing the path works. It skips the port and the partner profile, which is where a real IDoc usually fails.
• Editing the data until it posts. That proves your mapping can accept good data. It proves nothing about what the sender actually sends.
• Leaving test IDocs in the system. A month later nobody can tell them from real ones, and they are in the reporting.
• Running it in production against a live partner. The test is only a test on your side.
• Not recording which IDoc the test was copied from. The original is the evidence, and without it the test is an anecdote.