RFC callback call rejected by whitelist error appear

When a new screen will appear after clicking on layout button, the following error is occurred then follow below steps as a solution:

RFC callback call rejected by whitelist error

RFC callback call rejected by whitelist error

Solution:

What is an RFC callback?

It's a mechanism the called server can initiate to the calling client during synchronous RFC calls.

Step :1

Use "RZ11" tcode enter this parameter "rfc/callback_security_method" and hit F8

RFC callback call rejected by whitelist error

Step :2

Click on Change Value Then add New Value that value to "0" and save the changes

RFC callback call rejected by whitelist error

the behavior of value is introduced below

Value 0:

Emergency fallback mode:

All whitelists are ignored.

Value 1:

Compatibility mode (default value):

Only callbacks prohibited by active whitelists are declined.

Value 2:

Simulation mode:

Only callbacks prohibited by active whitelists are declined.

Callbacks prohibited by non-active whitelists are qualified but logged in SAL.

Value 3:

Most secure mode:

Callbacks prohibited by active or non-active whitelists are declined.