Adding custom labels in SRM UI Add-on

Hi,

I'm following the Extensibility Cookbook SP07 as well as this thread here

Adding custom fields to SRM UI Add-on

I can't seem to display our custom label in product details page.

Here is our OTR-Text in SOTR_EDIT

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Clik here to view.

While our SPRO is this

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Clik here to view.

I'm trying to access the label via this code

     new sap.ui.commons.Label({ text : Appcc.getText("ZMAXORDER") + ":" })

I'm not sure if I miss something or if the code I have is wrong.

Your help is highly appreciated. Thanks.