When a specification title is modified as Lars suggested, it will appear in the drop-down. You are never required to type a specification name when printing an Adagio document.
Also ensure that from the File / Specification Options within the Specification Designer program, you select the correct type of document. If you intend this spec to be used for printing invoices, then choose either Invoices or All for the spec type. If something else appears here, such as Orders or Credit Notes, then the spec title will not appear on the drop-down list when printing invoices.
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Regards,
Softrak Tech Support