Identifying correct setup for inbasket link to form fields

Assuming you built/modified a special PO20 screen and wrapped it in a portal page this should get you started:

1) Data Map - Company, PO Number, PO Release, PO Code (Min required fields to inquire on PO20)

2) Add the following code to the portal page (Changes to the names based on your naming convention will need to be made first)

function portalpage_OnInit()
{
page.addElement("PCR-COMPANY",page.parameters.PCR_COMPANY);
page.addElement("PCR-PO-NUMBER",page.parameters.PCR_PO_NUMBER);
page.addElement("PCR-PO-RELEASE",page.parameters.PCR_PO_RELEASE);
page.addElement("PCR-PO-CODE",page.parameters.PCR_PO_CODE);
return true;
}

Thanks Robert. I appreciate the response, but that isn't my issue.
The problem I am having is just getting form PO20.1 to work as delivered.
I have defined the the PO20.1 form with 4 key fields.
The 4GL trigger code fills in the four values.
The folder records gets generated and the values are set in a key string.
The string looks ok to me.
Company, PO_NUMBER, PO_RELEASE and PO_CODE
but when I click the link, when the PO20 comes up in the folder section of the workunit, the values are not filled in. I want the PO to come up.
The fields are blank when the folder link is clicked. I do not know the correct values for FIELD NBR on the Folder Variables form definition. Everything else looks ok to me