cratti, when I reassembled my PT-145 I did not get the take down pin back in correctly and the slide would not close. I'm thinking the 2 firearms are similar in this respect.
Here's what the manual says:
3. When reinstalling the SLIDE DISASSEMBLY LATCH or TAKEDOWN PIN, you must make sure that the barrel is fully forward in the slide so that when you insert the latch, with the lever pointing to the rear, the horizontal round part of the latch must be pushed through the frame and the mating portion of the bottom of the barrel. Once these parts have been lined up, and you gently push the latch in, a click will be heard indicating that the latch pin is secured in place.
4. The SLIDE CATCH ten can be depressed which allows the SLIDE to go forward.
I hope this helps. Been there. Done that.