Suppose an officer of CIA is able to recruit a person who belongs to the intelligence service in Russia, the FSB. As the two sides have experienced issues where their files were taken to the opposite side, the officer of CIA might create an “eyewash” entry in order to shield the latest source.
When the hiring effort is being written about, he/she may write that there was an endeavor to obtain data; however, the agent from FSB rejected the plan. It is similar to being untruthful to your individual diary.