While setting up a Lead integration scenario, you cannot find the Category field.
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SAP Cloud for Customer with Lead integration scenario
Lead Categories are maintained first under the Leads fine tune activity under the action 'Maintain Categories' (Business Configuration > Lead Fine Tuning Activity) and then under the 'Code List Mapping for Integration with External Applications and Solutions' Fine Tuning Activity --> Maintain Code List Mapping--> select the relevant Mapping Group and then, under LeadGroupCode, you should maintain the mapping.
code list mapping, integration, lead , KBA , LOD-CRM-LM , Lead Management , How To