Creating a project contract through X++ (New question)

Hi experts,

I am here again, with problems creating a project contract through X++.

Previously, I was following https://dynamicsuser.net/ax/f/developers/51941/project-contract-creation-using-x , and apparently, I was lost at the step: "this.parmprojectcontract(projinvoiceTable.ProjInvoiceProjId);" shown inside the code. The user apparently did not mention where and how the parmprojectcontract method was or works. So I could not go any further than that steps.

Could anyone kindly guide me through the creation of a new project contract using X++ in Dynamics 365?

Thanks in advance.

Lincoln Poh