Split transactions in a single anchor function

Question

Let's say I have PDA A, PDA B, and PDA C. PDA A has lamports. And I like to split lamports to B and C. Is it possible in a single anchor function to transfer lamports from A to B and C?

// TRANSACTION 1 (From A to B)
**ctx.accounts.account_b.to_account_info().lamports.borrow_mut() = account_b_lamports
            .checked_add(lamports_to_b)
            .unwrap();

**ctx.accounts.account_a.to_account_info().lamports.borrow_mut() = account_a_lamports
            .checked_sub(lamports_to_b)
            .unwrap();

 // TRANSACTION 2 (From A to C)
**ctx.accounts.account_c.to_account_info().lamports.borrow_mut() = account_c_lamports
            .checked_add(lamports_to_c)
            .unwrap();

**ctx.accounts.account_a.to_account_info().lamports.borrow_mut() = account_a_lamports
            .checked_sub(lamports_to_c)
            .unwrap();

Is this possible? I'm running into a program error: Error processing Instruction 0

Answer 1

I was able to solve this by setting up the transaction like this..

// TRANSACTION 1 (From A to B)
**ctx.accounts.account_b.to_account_info().lamports.borrow_mut() = account_b_lamports
            .checked_add(lamports_to_b)
            .unwrap();

// TRANSACTION 2 (From A to C)
**ctx.accounts.account_c.to_account_info().lamports.borrow_mut() = account_c_lamports
            .checked_add(lamports_to_c)
            .unwrap();

// SINGLE TRANSFER OUT FROM A
**ctx.accounts.account_a.to_account_info().lamports.borrow_mut() = account_a_lamports
            .checked_sub(total_lamports_to_c_and_b)
            .unwrap();

I'm not sure the reason why but this ended up working.