passing parameters to a PL/SQL package at the IMPORTER level when defining a custom Integrator

I have defined a Custom WEB ADI Integrator.

In the Importer I have a PL/SQL Package that takes a Batch NUmber as INput parameter.

The param name in the PAckage is P_BATCHNO.

All the documents says that the this param name should be mapped to REFERENCE name column in the parameter list.

I don't see that column in the screen.

Could anyone tell me how to get around this and which table has this Reference Name field column mapped to????

This is at the "IMPORTER CONCURRENT PROGRAM SUBMISSION" Screen.

REfer to page 40 in the attached document.

Any help is greatly appreciated. We are on 12.1.3