The Ticket Header "Sales Order" field do not show the External Sales Order ID that was replicated from an external system.
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The Ticket header Sales Order field is used only for internal C4C Sales Order IDs.
For external Sales Orders IDs (replicated), you need to use the field "External Sales Order ID", which is available within the following path:
Ticket Overview ->'Integration' table/Section Group-> 'External Sales Order ID' field.
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