A Full Bench of the Apex Court held as follows regarding a query, whether a PoA Holder can file a complaint u/s 200 CrPC in a NI Act case.

From Para 26,

26) While holding that there is no serious conflict between the decisions in MMTC (supra) and Janki Vashdeo Bhojwani (supra), we clarify the position and answer the questions in the following manner:
(i) Filing of complaint petition under Section 138 of N.I Act through power of attorney is perfectly legal and competent.
(ii) The Power of Attorney holder can depose and verify on oath before the Court in order to prove the contents of the complaint.
However, the power of attorney holder must have witnessed the transaction as an agent of the payee/holder in due course or possess due knowledge regarding the said transactions.
(iii) It is required by the complainant to make specific assertion as to the knowledge of the power of attorney holder in the said transaction explicitly in the complaint and the power of attorney holder who has no knowledge regarding the transactions cannot be examined as a witness in the case.
(iv) In the light of section 145 of N.I Act, it is open to the Magistrate to rely upon the verification in the form of affidavit filed by the complainant in support of the complaint under Section 138 of the N.I Act and the Magistrate is neither mandatorily obliged to call upon the complainant to remain present before the Court, nor to examine the complainant of his witness upon oath for taking the decision whether or not to issue process on the complaint under Section 138 of the N.I. Act.
(v) The functions under the general power of attorney cannot be delegated to another person without specific clause permitting the same in the power of attorney. Nevertheless, the general power of attorney itself can be cancelled and be given to another person.

Citations: [2014 ALT CRL AP 1 44], [2013 SCALE 11 360], [2013 KERLT 4 21], [2014 AIR SC 630], [2014 CALLT SC 1 53], [2014 PLJR 1 216], [2013 OLR 2 884], [2013 BC 4 212], [2013 CTC 5 560], [2014 SCC 11 790], [2013 CLA SC 117 4], [2013 COMPCAS SC 180 258], [2014 AKR 1 314], [2013 KLJ 4 279], [2014 LW 1 698], [2013 PLR 4 733], [2013 NCC 2 854], [2014 ALD CRL SC 1 649], [2013 KHC 3 885], [2013 WLN SC 4 25], [2013 ALLCC 83 583], [2014 LW CRL 1 154], [2014 SCC CIV 4 343], [2013 SUPREME 6 705], [2014 CRLJ SC 576], [2013 AIOL 611], [2013 JT 12 524], [2013 SLT 8 133], [2014 DCR SC 1 135], [2013 SCC ONLINE SC 839], [2013 AIC 131 160], [2014 ECRN 1 486], [2013 BOMCR CRI SC 4 307], [2013 JCC NI SC 4 214], [2013 RCR CIVIL SC 4 382], [2014 JLJR SC 1 48], [2013 BOMCR SC 6 424], [2013 RCR CRIMINAL SC 4 306], [2013 ALLMR CRI SC 4048], [2013 MLJ CRL 4 213]

Other Sources:

https://indiankanoon.org/doc/47858029/

https://www.casemine.com/judgement/in/5609af2ae4b0149711415b31

https://www.legalauthority.in/judgement/a-c-narayanan-vs-state-of-maharashtra-4779