B737 air carrier pilot reported receiving an approach warning message at 600 feet but was configured and stable so they continued the approach and landed.

Narrative

The weather at CLT was IFR. The ceiling was reported at 900 AGL visibility was 10 NM or greater. Once we were established on the final approach segment; I selected AIII for the approach guidance in the HUD. I briefed the First Officer (FO) that I was using the AIII Mode for proficiency and since I anticipated VMC conditions below the reported ceiling; we would monitor the approach guidance and HAP panel but only execute a missed approach if we were not stable. We broke out about 1200 AGL and proceeded in VMC conditions. At approximately 600 AGL I got an 'APPROCH WARN' flashing in the HUD. The FO confirmed the same on the HAP panel. Since we were in VMC conditions; fully configured and stable; I told the FO we would proceed to a landing. We landed uneventfully. Upon clearing the runway; I reported to the Ground Controller I felt we may have experienced 5G interference on short final. Upon arrival at the gate; I made an entry in the log regarding the anomaly and reported the entry to CLT station maintenance. The airplane was taken out of service for another issue and we swapped airplanes. Continued monitoring of the potential for 5G interference is crucial going forward. Had the conditions required an actual CAT III approach; we would have been compelled to execute a missed approach and may have been forced to proceed to our alternate.