When you mention 'GEDCOM compatible entry" in relation to genealogy software in general the main issue is the wide variety of interpretations of the GEDCOM standard applied by software producers, i.e. problem it is not, strictly speaking, the GEDCOM standard that is the problem, but miss-understanding or miss-application of the standard by programmers. It's a bit like the English language: There is only one English language, but there are many 'locally created' dialects which limits understanding and confuses users. With GEDCOM this often means that either:
- some data may not be exported fully or correctly to a GEDCOM file by some software applications; plus
- some data which is exported to a GEDCOM file by one product may not be correctly imported by another product because it doesn't fully understand the dialect used.
As far as 'an official lists' of GEDCOM incompatibilities go, that's a bit like an "How long is a piece of string?" question, given the volume of current genealogy products available; plus those products/versions that are no longer supported. One attempt was made here: http://genealogytool...apps-crosswalk/ to inform FTM users when Ancestry announced that they were dropping support for desktop software; and before the FTM software was sold-on to Software MacKiev.
The cynic in me also says that, while most genealogy products claim 'GEDCOM compatibility':
- their developers are rarely clear about which version of the GEDCOM Standard they mean and tend to adopt a 'mix and match' approach across multiple versions of the standard to suit their own interpretation, despite how long it has been since the Standard was last amended;
- few software developers provide any specific detail on where their software does/doesn't conform with the standard and what data is likely to be 'lost' when exporting data to GEDCOM;
- most Software Users have a naive belief in developers' claims that their chosen software does everything properly; and that it's always the fault of some other software when data doesn't transfer fully/correctly; and
- there is limited (minimal) business benefit or commercial advantage in software developers enabling their users to easily move their data to other software products with 100% reliability.