Why my Doc. Field not showing in Doc. Composer?

All properties of the document are shown below. You can see that the Doc. Fields are defined correctly, but why Doc. Composer still had invalid warning message?

Doc. Field not being recognized in Doc. Composer

This was because the new line was being inserted into the Doc. Field when created. In MS Word, the new line will in fact break the content into different paragraphs that causing the Doc. Composer fail to process the Doc. Field.

Paragraph break within Doc. Field make Doc. Composer cannot process it

By removing the paragraph break (i.e. replaced it by space) then the Doc. Field will be able to correctly recognized by the Doc. Composer.

Doc. Field being processed after removing new line