Dutch to English Bus/Financial Investment / Securities

In a company's articles of association ("statuten"), there is a paragraph about the register of shareholders that the company has to keep. The register includes such details as the names and addresses of the shareholders, usufructuaries and holders of a right to pledge. The paragraph continues as follows:

Bovendien vermeldt het register de datum waarop de aandelen of het recht werden verkregen, de datum van erkenning of betekning, alsmede van...

Could anyone tell me please what "de datum van erkenning of betekening" means here please?

"the date of acknowledgement or ??"

Thanks in advance for any help.