Hey everyone. Weird issue I've encountered today... inventoryAdjustmentId is '59424' typeof inventoryAdjustmentId is string (I've also casted it to a Number, but still the same issue): //This code errors (SSS_MISSING_REQD_ARGUMENT) "Missing a required argument: id": record.submitFields({ type: record.Type.ASSEMBLY_BUILD , id: assemblyBuildId , values: { custbody_cat_swp_relatedadjustment: inventoryAdjustmentId } }); //But this works: var assemblyBuild = record.load({ type: record.Type.ASSEMBLY_BUILD , id: assemblyBuildId }); assemblyBuild.setValue({ fieldId: 'custbody_cat_swp_relatedadjustment' , value: inventoryAdjustmentId }); assemblyBuild.save();