Manually created User Define RDML Built-In-Functions ie UD_YYYYYYYYYYYYYYY are not visible in the User Defined Built-In Functions section when adding objects to a Deployment Tool Package. They are instead located in the Process/Functions section.
To Deploy to an Execution Environment
To deploy the runtime DLL select the Built-In-Function through the Process/Function Option in the Deployment Tool.
To Deploy to a Development Environment
For Development, make sure you select the option to Deploy to Development System in the Setup Details (*SYSEXPORT) so that tables LX_F47 and LX_F48 are propagated to your new environment. Optionally you can select the User Defined Built-In-Function via the Process/Function to add the Built-in Function's DLL to your Package for deployment to another Development Environment.