How to book a sales entry in vendor account and have a single ledger/statement of debit / credit ?

How to book a sales entry in vendor account and have a single ledger/statement of debit / credit ?

Dear Zoho Team, 

We have vendors who are our customers also for some goods. We need to record the sale made to them so we created a customer account for them too and linked both customer and vendor account to each other, but unfortunately there is no provision to see both sale and purchase statements in one single account. 

Referring two statements is an annoying task. Software like Tally has this BASIC simple feature and I am sure other ZOHO books subscribers might be facing the same issue. 

Kindly help me out in this.