In BANK OF INDUSTRY LTD v. AWOJUGBAGBE LIGHT INDUSTRIES LTD (2018) LPELR-43812(SC), page 7 para. B-D, per Rhodes-Vivour JSC, reiterated the above principle of law thus: “This Preliminary Objection is against the hearing of this suit. In Isah v. INEC & 3 Ors (2014) 1-2 SC (Pt.iv) p.101. I explained Preliminary Objections and when to file them and when not to file them. I said that: “A Preliminary Objection should only be filed against the hearing of an appeal and not against one or more grounds of appeal which are not capable of disturbing the hearing of the appeal. The purpose of a Preliminary Objection is to convince the Court that the appeal is fundamentally defective in which case the hearing of the appeal comes to an end if found to be correct. Where a preliminary objection would not be the appropriate process to object or show to the Court the defects in processes before it, a motion on notice filed complaining about a few grounds or defects would suffice.
IF FACTS ARE RAISED IN PRELIMINARY OBJECTION, AN AFFIDAVIT MUST BE FILED
In Ama v. Nwankwo [2007] 12 NWLR (Pt. 1049) 552 at 578, Rhodes-Vivour, JCA (as he then was) stated the position of the law relating to preliminary objection vis-à-vis the necessity of filing a supporting affidavit thusly: Preliminary objection strictly speaking deals with law. Consequently there is no need for supporting affidavit, but the grounds of the objection must be clearly stated. For example, objection that court process has not been complied with, suit/process is an abuse of process. When, as often happens a preliminary objection strays from law to facts of the case, the onus is on the party relying on the preliminary objection to justify the facts, and this can only be done by filing an affidavit. A preliminary objection may be supported by affidavit depending on what is being objected to. If the preliminary objection is on law, an affidavit is unnecessary, but if on facts an affidavit is mandatory (emphasis is this Court’s).
— B.B. Kanyip J. FG v. ASUU (2023) – NICN/ABJ/270/2022