It is available in music stores, the new edition of Sonata 1 Benejam Lluís, and Transcriber Victor Manuel Morales says in the prologue ...
After tackling the transcription for flute of Sonata nr. 1 for violin and piano (1951) by Lluís Benejam, I have carefully revised the first edition together with this one, comparing them with the facsimile in order to avoid errors and clarify certain passages that were open to doubt (very few actually, because in general the composer has a very clear way of writing and there is hardly any crossing-out). The fact that the only available edition of the piece is the Clivis Publications edition has made this commitment even greater.