snowball - thanks for your question. I am going to move it to the PADS specific community so it will increase visibility among subject matter experts. The Member Resources area is primarily for general community questions and suggestions.
This may be a bit late but I'll answer this question so when people search it in the future they'll see the answer.
PADS Logic/Layout is based around the PartType defined in the library. Currently, you have two part types, 610-0020-001 and 610-0020-001-74LS244_SSOP_ALT and that is why the error pops up. They both have incomplete definitions so you'll get to that error next.
The simplest way to verify a parttype is usable is to use the 'check part' button in the part editor (Part Information dialog) that you can pull up from Logic or Layout (File -> Library (select a part and press <Edit>). That will tell you if the parttype is adequate (decal and logic gate with the corresponding pinout defined are the minimum).
Then you either need to replace the part(s) in Logic or/and Layout to use the complete part. In Logic select a component and then <right-click><Update>. In Layout you need to use the ECO process to replace a part.