Portuguese colonial coinage definition of obverse and reverse, for example Timor 1958 60 centavos

I place it here since this mostly affect the catalog descriptions and arrangements.

I come across multiple coins in the catalog that define the colony as obverse side of the coin and reverse the Portugal arms. An example most recently encountered in https://en.numista.com/catalogue/pieces14454.html. I thought about suggesting the change to this particular item but then researched a little more and saw a frequent use of the locality arms side as "obverse" and metropole's arms as "reverse" across the catalogue. It is my understanding however that Portuguese coinage as a rule will display the arms of Portugal and appropriate description on obverse and the colony/territory arms and name on reverse. But I admit that I do not use proper Portuguese catalogs. Can someone knowledgeable in the Lisbon mint rules and practices shed a light on this?

Obverse on Numista is defined as the side allowing issuer identification. In this case, the coinage is not for Portugal but for Timor hence the obverse being the one identifying Timor rather than Portugal.
Indeed a bit tricky in such case.

Thank you pejounet, I thought that it was a universal definition based on the issuing authority. I've been filing with "official" obverse up in my own coin folders for the first 10 years , then the last 10 years with the side that makes the coin most interesting to look at :-).

And I just requested fixing of last three that were done wrong on Numista, thanks for heads-up!