api readonly properties

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I am looking for an automated way of determine readonly fields in api. In synopsis schema there are marked required attributes but there is no information if field is readable.

 

Even if I have found that in schema blank few fields are missing, it seems that there are more readonly fields - eg in this thread:

http://www.prestashop.com/forums/topic/177305-solved-insert-new-product-over-the-webservice-postxml-add-with-html-tags/?hl=%2Breadonly.

 

thanks for any help or suggestions.