Unexpected behavior of the Find function on Sales/Purchase document line.
Follow the repro steps to understand the issue:
1.Take a NAV2017 CZ database with the last CU implemented
2. Create a new Sales Invoice
HEADER: Customer No. = 10000
3 Create a new document line
a) Type = G/L Account
b) No. = insert account with number 602120
c) Change the Description in the row to "Reklama". Confirm

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ACTUAL RESULTS
- Because there is an account named "Reklama" in the list of G/L Accounts,
the system automatically changes (without warning) the account number in the document line (inserts the searched account).

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EXPECTED RESULTS
- If the account number is already entered in the line, then no longer looking for another account when changing the description.
Or use a warning, similar as in the case when line type is = Item:
"We found an item with the description "XXX" (No. 70100).
Did you mean to change the current item to 70100?"