Task: Create, update, and retrieve a document from ERPNext

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,360],"parameters":{},"typeVersion":1},{"name":"Start","type":"n8n-nodes-base.start","position":[250,360],"parameters":{},"typeVersion":1},{"name":"ERPNext1","type":"n8n-nodes-base.erpNext","position":[650,360],"parameters":{"docType":"Item","operation":"update","properties":{"customProperty":[{"field":"item_tax_section_break","value":"5"}]},"documentName":"={{$json[\"name\"]}}"},"credentials":{"erpNextApi":"ERPNext API Credentials"},"typeVersion":1},{"name":"ERPNext","type":"n8n-nodes-base.erpNext","position":[450,360],"parameters":{"docType":"Item","properties":{"customProperty":[{"field":"item_name","value":"item 1"},{"field":"item_code","value":"item-1"},{"field":"item_group","value":"Products"}]}},"credentials":{"erpNextApi":"ERPNext API Credentials"},"typeVersion":1},{"name":"ERPNext2","type":"n8n-nodes-base.erpNext","position":[850,360],"parameters":{"docType":"Item","operation":"get","documentName":"={{$json[\"name\"]}}"},"credentials":{"erpNextApi":"ERPNext API Credentials"},"typeVersion":1}],"connections":{"ERPNext":{"main":[[{"node":"ERPNext1","type":"main","index":0}]]},"ERPNext1":{"main":[[{"node":"ERPNext2","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"ERPNext","type":"main","index":0}]]}}}