Custom Field set As Signature not showing on Form or Print Out

I added a custom field labelled “SIGNATURE” to my payslip item and indicated that it should show on printed documents. However, it does not show on printed documents neither does it appear on the entry form. It only appears when I enter a value in that “SIGNATURE” custom field. What am I doing wrong?

Find below the pictures for clarification;
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Custom fields will display only if they have content within them. This is part of Manager’s overall design philosophy of minimizing clutter. Search the forum. Example content for a signature box that will always show was recently posted in another topic.

My suggestion would be add custom field for national identity number and signature, and only needs your employee’s signature sign besides or under it the pre-filled national identity number. (since there is no limit by text box. or

Hire a programmer that knows liquid and able to code for you the payslip theme.