Updating an asset in Composer - hyperledger-composer

Question

namespace com.biz
participant User identified by name {
o String name
}
participant Bank identified by name {
o String name
o Integer points
--> Document document optional
}
asset Document identified by docname {
o String docname
o String doctype
o String hash
o String from
o String to
}
transaction UploadDoc {
--> Document document
}
transaction ShareDoc {
--> Document document
--> Bank bank
}
transaction SetupDemo {
}
Script File :
/**
*
* #param {com.biz.UploadDoc} uploadDoc
* #transaction
*/
async function uploadDoc(uploadDoc) {
uploadDoc.document.docname = 'BC1.jpg';
uploadDoc.document.doctype = 'BC';
uploadDoc.document.hash = '123456';
uploadDoc.document.from = 'Bank_1';
uploadDoc.document.to = 'User_1';
const ar = await getAssetRegistry('com.biz.Document');
await ar.update(uploadDoc.document);
}
/**
*
* #param {com.biz.ShareDoc} shareDoc
* #transaction
*/
async function shareDoc(shareDoc) {
shareDoc.document.docname = 'BC1.jpg';
shareDoc.document.doctype = 'BC';
shareDoc.document.hash = '12346';
shareDoc.document.from = 'User_1';
shareDoc.document.to = shareDoc.bank.name;
const dr = await getAssetRegistry('com.biz.Document');
await dr.update(shareDoc.document);
}
/**
*
* #param {com.biz.SetupDemo} setupDemo
* #transaction
*/
async function setupDemo(setupDemo) {
const factory = getFactory();
const NS = 'com.biz';
const user = factory.newResource(NS,'User','User_1')
user.name='User_1';
const banks = [
factory.newResource(NS,'Bank','Bank_1'),
factory.newResource(NS,'Bank','Bank_2')
];
banks[0].name = 'Bank_1';
banks[1].name = 'Bank_2';
banks[0].points = 100;
banks[1].points = 100;
const userRegistry = await getParticipantRegistry(NS + '.User');
await userRegistry.addAll([user]);
const bankRegistry = await getParticipantRegistry(NS + '.Bank');
await bankRegistry.addAll(banks);
const documents = [
factory.newResource(NS, 'Document', 'Pa60.jpg'),
factory.newResource(NS, 'Document', 'Pa80.jpg')
];
documents[0].docname = 'Pa60.jpg';
documents[0].doctype = 'DrivingLicense';
documents[0].hash = '12345';
documents[0].from ='Bank_1';
documents[0].to = 'User_1';
documents[1].docname = 'Pa80.jpg';
documents[1].doctype = 'DrivingLicense';
documents[1].hash = '123456';
documents[1].from ='Bank_1';
documents[1].to = 'User_1';
const docRegistry = await getAssetRegistry(NS + '.Document')
await docRegistry.addAll(documents);
}
Issue : First I run transaction SetupDemo. Runs fine.
Next, I run transaction UploadDoc. Runs fine. Pa60.jpg is updated as BC1.jpg. ID given in Plyground for submitting transaction : Pa60.jpg
Next, I want to run ShareDoc transaction. If I give ID as BC1.jpg while submitting transaction, 'Object with id 'BC1.jpg' not found' error.
Please help me resolve the issue.