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Shreya SalesforceShreya Salesforce 

My requirement is - On Invoice object, there is a credit memo button. On click this button, we create a credit memo in Salesforce and integrates with credit Memo in Netsuite.

Hii...I am new in Salesforce.
In project, Apptus package is installed. And I am not able to see Apex class because of managed package. 
My requirement is - On Invoice object, there is a credit memo button. On click this button, we create a credit memo in Salesforce and integrates with credit Memo in Netsuite.
There are also some validations on Visualforce page. i am not able to create credit memo in Salesforce and also not to see Apex class.
What should i have to do??