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I'm trying to remove the line
//remove existing inventory detail //
var inventory = Rec.getCurrentSublistSubrecord({sublistId: 'item',fieldId: 'inventorydetail'});	
 var line_count=inventory.getLineCount({sublistId: 'inventoryassignment'});

                               for(var b=line_count-1;b&gt;=0;b--){
                                 inventory.removeLine({
                                   sublistId: 'inventoryassignment',
                                   line: b,
                                   ignoreRecalc: true
                                 });							
                               }	

I get the message at var inventory = Rec.getCurrentSublistSubrecord({sublistId: 'item',fieldId: 'inventorydetail'});

use <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4600423347.html|Record.hasCurrentSublistSubrecord> first