BMXAA2256E - Field Signature Option is read-only.

You are trying to hide the following fields in Create Requisition (CREATEDR) application:
- Card Type
- Card#
- Card Verification Value
- Expiration Date

Listed below are the steps being taken in trying to achieve this task: 

1. Open CREATEDR in Application Designer
2. Click Select Action, Choose Add/Modify Signature Options
3. Create J_HIDECREDIT
4. Right-click Card Type Control, choose Properties
5. Click Advanced Tab
6. Select J_HIDECREDIT for Signature Option
7. Receive the following error: BMXAA2256E - Field Signature Option is read-only.
8. You receive the same error when you try to do the same through Configure Conditional Properties
9. You receive the same error when you try to do the same with the other fields   Card#, Card Verification Value, and Expiration Date.

It does appear these specific Control Properties are read-only and you have not found a way to change that.

You cannot modify some property settings in the fields from Charge Information section from CREATEDR app. You are trying to add a Signature Option on that, and getting : 

BMXAA2256E - Field Signature Option is read-only.

This is working as designed. The reason is because the worklog section is being included from the library.xml; the application designer does not support direct editing of those included
sections. You have to export the library.xml and edit it in there, then reimport the library.xml. Once you do that to include sigoption property to the desired controls in library.xml, and reimport library.xml into Application Designer, you will be able to hide the fields, after a Maximo server restart.

See ya