A particular Line level attribute not available from the REST call - URLDATA

Summary:

Instance ID line level attribute not available from the REST call - URLDATA

Content (please ensure you mask any confidential information):

I am trying to fetch itemInstanceId_l ( line level attribute ) from the response of urldata, but I don't get this particular attribute in the response.

I can fetch all other line attributes but this one.

Appreciate your help in this.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

// headers = this has the correct username and password values

endpoint1  = "https://CompanyName.bigmachines.com/rest/v15/commerceDocumentsOraclecpqoTransaction/"+BS_ID+"/transactionLine";