RFC callback call rejected by whitelist
ABAP Programming Error & Solution Guide
When a new screen appears after clicking on the layout button, the following error occurs. Follow the below steps for a solution:
RFC callback call rejected by whitelist error
Solution
What is an RFC callback?
It's a mechanism where the called server can initiate a callback to the calling client during synchronous RFC calls.
Step 1
Use transaction code RZ11, enter parameter rfc/callback_security_method and hit F8.
Step 2
Click on Change Value, set the value to 0 and save the changes.
Explanation of Values
Value 0: Emergency fallback mode - All whitelists are ignored.
Value 1: Compatibility mode (default) - Only callbacks prohibited by active whitelists are declined.
Value 2: Simulation mode - Same as compatibility mode but logs prohibited callbacks in SAL.
Value 3: Most secure mode - Callbacks prohibited by active or non-active whitelists are declined.