ανώμαλος = abnormal. irregular


επικύρωση = validation, confirmation

δικαιοπραξία = legal act, legal action, legal transaction

See:

In both cases, shoes are given as a token payment to validate an irregular legal transaction and perhaps also to circumvent legal obstacles.[28] This usage of the shoe may be supported by the verses in Amos (2:6; 8:6), which refer to selling a poor person in exchange for shoes. While it may be legal to sell an impoverished ...
http://etzion.org.il/en/boaz-if-go’el’s-shoe-fits

The nullity is defined as a legal sanction that strikes an irregular legal act, according to the required elements of validity130. The nullity is intended to deprive the legal act of the legal effects it would have to produce. So the contract is deemed never to have existed. So, in case of breach of duty of good faith, a legal act ...
https://www.memoireonline.com/01/16/9416/m_Case-law-based-an...


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Note added at 1 hr (2017-12-17 16:11:03 GMT)
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You can also call it an “abnormal legal transaction”. See:

Moreover, it is also seen an unclear delimitation among the different elusive categories and the anti-avoidance provisions regulated in the GTA among Central. Economic Administrative Court case-law. In fact, the abnormal legal transaction is tacitly assimilated to the fraus legis and the sham –including the consequences at ...
http://www.eatlp.org/uploads/public/Spain (11 November 2015)...


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Note added at 1 hr (2017-12-17 16:58:13 GMT)
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“Δικοπραξία” is also frequently translated merely as “transaction” or “act”, (see: https://www.linguee.com/greek-english/translation/δικαιοπραξ... ), so you could also simply say, “validation of an irregular (or abnormal) transaction (or act)”.

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Note added at 16 hrs (2017-12-18 07:19:32 GMT)
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In support of “validation of an irregular act”, please see:

Dental Technicians Act, 1979 (Act No. 19 of 1979). Chapter 1 : The South African Dental Technicians Council: Objects, Functions and Powers. 15. Rectification of errors and validation of irregular acts ...
https://www.acts.co.za/iframe/dental-technicians-act-1979/15...

Validation of Irregular Acts. All acts done at any meeting of the Board or of a sub-Board appointed by the Board or by any person acting as a Board Member or sub-committee member shall notwithstanding that it is afterwards discovered that there was some defect in the appointment or continuance of office of such Board ...
www.friendsofparkssa.org.au/_literature_146774/Constitution...

Rectification of errors and validation of irregular acts; Chapter 2 : Registration of Practitioners and Students. Registration of Practitioners. 14. Keeping of registers;
https://www.acts.co.za/allied-health-professions-act-1982/al...

AUSTRALIAN ADVISORY BOARD ON AUTISM SPECTRUM DISORDERS LIMITED ... Constitution of Australian Advisory Board on Autism ... 18.8 Validation of irregular acts ..
http://www.autismadvisoryboard.org.au/uploads/10 Constitutio...

PLANNING INSTITUTE OF AUSTRALIA ACN: 151 601 937 CONSTITUTION Date: 8 September 2017 PLANNING INSTITUTE OF AUSTRALIA ... 22.7 Validation of irregular acts ...
https://www.planning.org.au/documents/item/4

18.6 Validation of irregular acts 39 19 Secretary 40 20 Minutes 40 21 Seal 41 21.1 Seal 41 21.2 Use of Seal 41 22 Declaration of dividends 41 22.1 Declaration ...
https://www.stockland.com.au/~/media/corporate/pdf/investor-...

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Note added at 16 hrs (2017-12-18 08:01:33 GMT)
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In support of “validation of an irregular transaction”, see:

. to bind the company or authorise others to do so. Section 40(2)(b)(i) means that, when a person invokes s 40 to validate an irregular transaction of a company, it cannot be said that s 40 does not apply because the circumstances were such that the person ought to have enquired about the matters specified in s 40(2)(b)(i).
https://books.google.gr/books?id=C_k5BAAAQBAJ&pg=PA622&lpg=P...

In order to safeguard the Commission from any difficulties which might arise through the validation of irregular transactions in regard to the parts of estates already colomsed, the new law confers upon the General Directorate of Coloisation in Macedonia the right to exchange areas of land for land of equal value belonging to ...
http://heinonline.org/HOL/LandingPage?handle=hein.journals/l...

Perform manual collection fee to customers for payments to third parties Validation of transactions debited revolving credit Validation of irregular transactions (operations performed without ... Legal Secretary Rogers, Hofrichter & Karrh － Fayetteville, GA Organized and maintained law libraries, documents and case files.
https://resumes.livecareer.com/georgia/tyrone/business?pg=1