Implement custom template detail like installment plan detail

Hello,

The logic of this list creation is located in the "SupplyPaymentDetailV2" module in the "initItemTemplates" method that is triggered by the "init" method in the same "SupplyPaymentDetailV2" module. This formed list of templates is than connected to the "AddTypedRecordButton" button in the "controlConfig" property:

{
						"operation": "merge",
						"name": "AddTypedRecordButton",
						"values": {
							"caption": "",
							"click": {"bindTo": "onAddButtonClick"},
							"controlConfig": {"menu": {"items": {"bindTo": "ItemTemplates"}}}
						}
					},

So the logic of populating the list of templates is located in the "initItemTemplates" method that should be debugged further.