M1 in the RIS format

I am working on importing a large database from Reference Manager into Zotero. Since some of the RefMan fields are not supported in Zotero I want to send the information into 'extra' (e.g. RP for reprint status). Thus I have replaced RP, U1, U2; U3 to M1 in the RIS text file.
This works fine for all categories besides book chapter. Here the M1 is put into # of volumes (my translation from German).
I tried to find a mapping description for the RIS import into Zotero. Which RIS field in which categorie is imported to which Zotero field. That would be a big help. If this is not available can please somebody let me know which RIS field in the CHAP category is imported into teh Extra-category of Zotero?
Best
Stefan
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