E1 Pages - Getting defaults into the Form Controls on entry

Hi folks,

I've been asked to add an icon to a page which points to the Batch Version launch screen P98305W but to auto default 'R554111X' into the UBE field

I was thinking of the Parameterised URL feature and the FormDS, but the jas server changes each ENV, so I can't do that

I found this, just not sure how to use it
function runE1App(appId, formId, version, menuSysCode, taskName, formDSTmpl, formDSData);

Thanks

John