Senior management bears the ultimate responsibility for approving a financial institution's relationship with a politically exposed person (PEP). The institution must ensure that appropriate measures are taken to manage the risks associated with a PEP, including conducting enhanced due diligence and applying appropriate mitigating measures. The relationship manager and the OKYC analyst may identify the risks associated with the PEP and recommend mitigating measures, but it is ultimately the responsibility of senior management to approve the relationship and ensure that the appropriate measures are taken. The enhanced due diligence compliance officer is responsible for ensuring that all due diligence requirements are met.

the account officer should avoid disclosing any details of the investigation to the customer, as this could compromise the integrity of the law enforcement inquiry, or even constitute tipping off, which is a criminal offense in many jurisdictions12. The account officer should only inform the customer that a legal request has been made, and that the bank is obliged to comply with it, without revealing the nature or scope of the request3. The account officer should also document the communication with the customer, and report it to the appropriate internal authority, such as the compliance officer or the legal department4.
1: CAMS Study Guide, 6th Edition, Chapter 5: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), page 151-152. 2: Tipping Off: What It Is and How to Avoid It, ACAMS Today, March 2019. 3: How to Handle Law Enforcement Requests, ACAMS Webinar, June 2018. 4: Best Practices for Responding to Law Enforcement Inquiries, ACAMS White Paper, October
2017.

A financial institution should examine the country or location where the customer is from or does business, the type and size of the business the customer runs, and the legal structure of the customer's business, because these factors can indicate the level ofmoney laundering risk associated with the customer. For example, some countries or locations may have weak anti-money laundering laws or high levels of corruption, some types or sizes of businesses may be more prone to generating or concealing illicit funds, and some legal structures may be more complex or opaque than others, making it harder to identify the beneficial owners or controllers of the customer.
ACAMS CAMS Certification Video Training Course1, Module 2: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), Lesson 2: Know Your Customer (KYC) and Customer Due Diligence (CDD) ACAMS CAMS Certification Study Guide2, Chapter 2: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), Section 2.2: Know Your Customer (KYC) and Customer Due Diligence (CDD), Pages 42-44

According to the Certified Anti-Money Laundering Specialist (CAMS) Manual , 6th edition, if a bank's transaction surveillance system triggers an alert for a deposit of 250.000 USD into a client's account, the bank should take the following actions:
Request information and documentation from the client on the background of the transaction (CAMS Manual,
6th edition, page 46).
Contact the client advisor to learn if he has any insight on the transaction background (CAMS Manual, 6th edition, page 47).
Review the transaction background in the bank's transaction platform (CAMS Manual, 6th edition, page 47).
Discarding the alert as a false positive hit and reviewing the alert if the deposit is made in cash should not be done.
The bank should request additional information and documentation from the client to better understand the nature of the transaction. Additionally, the bank should reach out to the client advisor to learn if they have any insight on the transaction background. Finally, the bank should review the transaction background in the bank's transaction platform to determine if any additional alerts or anomalies are present. (CAMS Manual, 6th Edition, Pages 117-118)

The European Union Fourth Anti-Money Laundering Directive (4th AMLD) is a legal framework that aims to prevent the use of the Union's financial system for the purposes of money laundering and terrorist financing.
One of the provisions of the 4th AMLD is to lower the currency threshold for cash payments from €15,000 to
€10,000. This means that any person who makes or receives cash payments of €10,000 or more, whether in a single transaction or in several linked transactions, is subject to customer due diligence and record-keeping obligations. The 4th AMLD also extends its applicability to providers of gambling services, which are now listed as 'obliged entities'.
Directive - 2015/849 - EN - Fourth Anti-Money Laundering Directive - EUR-Lex, Article 11 and Recital 23.
EUR-Lex - 02015L0849-20210630 - EN - EUR-Lex, Article 11 and Recital 23.
Key elements of the 4th EU Anti-Money Laundering Directive, Section: Cash payments.
Anti-money laundering and countering the financing of terrorism legislative package, Section: New EU AML
/CFT Regulation.
Reference:https://www.acams.org/aml-resources/eu-fourth-aml-directive/