Can i set up Asset and Participiant ID automatically in the transaction? - hyperledger-composer

Question

I'm working with Hyperledger Composer and when i submit a transaction , i have to add manually the ID of Asset and Participiant. Is there a way to set up these ID automatically Without add it whenever i have to submit a transaction? Is there a javascript example code of smart contract ? Thanks.
CTO file
participant Patient identified by ID_P {
o String ID_P
o String name
o String surname
o String Birth regex=/[0-9]+\-[0-9]+\-[0-9]/
o String CF regex=/[A-Z0-9]{11}/
}
asset Health_Provision identified by ID_CF {
o String ID_CF
o Type type
o String[] Date regex=/[0-9]+\-[0-9]+\-[0-9]/
o String NoteFromToDoctor
o String NoteFromToCup
o String Receipt
o String SignNRE
o String Priority
o String Name
o String Surname
o String CF
o String Birth
o String Exemption
o RequestSubstitution substate
o Make_Health_Provision_Prescription[] requests optional
o Make_Health_Provision_Reservation[] reqs optional
--> Patient Applicant
--> Doctor doctor
--> CUP cup
}
transaction SendPrescription {
o String NoteFromToDoctor
o RequestSubstitution substate
--> Health_Provision IDCF
--> Patient Applicant
--> Doctor newDoctor
}
Logic.js
function SendPrescription(tx) {
var IDCF = tx.IDCF;
tx.IDCF.doctor = tx.newDoctor;
return getAssetRegistry('org.example.healthdata.Health_Provision')
.then(function (assetRegistry) {
return assetRegistry.update(tx.IDCF);
});
I explain better : when i submit the send prescription transaction , i have to add manually the ID Asset every time i want to submit a transaction. But i want to automate this transition and i don't understand how i could do that.
In this image , when i have to submit the transaction , there are random numbers associated to Asset ID , Patient ID and Doctor ID. I have to add mandatorily the ID of my Asset ,Patient and Doctor manually every time i submit the transaction? In your opinion can i automate that?
enter image description here