Seems very similar to: https://bugs.kde.org/show_bug.cgi?id=328280
And possibly related to: https://bugs.kde.org/show_bug.cgi?id=392477 (At least I discovered this bug while following the workaround mentioned there).

Basically the issue is as in the title.

Reproducible: Always

Steps to Reproduce:
1. Open the ledger for an Investment Account
2. Enter a new security.
3. Complete the wizard.
4. Fill out the rest of the New Transaction form with data
5. Attempt to enter the transaction.

Actual Results:  
There is no way to enter the transaction. The Enter button is disabled and pushing the "Enter" key on my keyboard does nothing.

The new security name is filled out in the form. If you select a different and already existing security then try to select your new security, the new security does not exist. While you have selected a different and already existing security it is possible to enter the transaction.

If you go to the "Investments" page for the account you just tried to create a new security in, the new security does show up in the list. If you then return to the Ledger for the account, you can now select the new security and enter transactions like normal.


Expected Results:  
You should be able to enter the transaction immediately after completing the New Security Wizard and filling out the other necessary information in the New Transaction Form. Switching to the Investments page and back should not be necessary.