when the defendant raises the defense of ownership in [her] pleadings and the question of possession cannot be resolved without deciding the issue of ownership, the issue of ownership shall be resolved only to determine the issue of possession. In other words, where the parties to an ejectment case raise the issue of ownership, the courts may pass upon that issue to determine who between the parties has the better right, to possess the property. However, where the issue of ownership is inseparably linked to that of possession, adjudication of the ownership issue is not final and binding, but only for the purpose of resolving the issue or possession.
The principal issue must be possession de facto, or actual possession, and ownership is merely ancillary to such issue. The summary character of the proceedings is designed to quicken the determination of possession de facto in the interest of preserving the peace of the community, but the summary proceedings may not be proper to resolve ownership of the property. Consequently, any issue on ownership arising in forcible entry or unlawful detainer is resolved only provisionally for the purpose of determining the principal issue of possession.