Sorry to intervene, but I was somehow already put in this thread...
AFAIK, I agree with Andres, as one of the identifying peculiarities of the Erla-built G-14/ASs was the lower nose cowl devoid of chin bulges, so the first two "foreign" elements toward the ID of the plane in the photo as an "Erla G-14/AS" are the lower cowl and the tall tailwheel... but there is a third element, namely the higher oil filler cap which was typical of an enlarged annular nose oil tank.
Now, it is true that many "normal" G-14s produced by Erla showed such an oil tank, but this would be a "first" for their G-14/AS, in addition to the fact that the rectangular plate would be another "first" for the G-14/AS, which lead us to square one...
Maybe a possible (and maybe simpler) explaination for this aircraft could be a typical Erla G-10 which had received a replacement lower cowl adapted from an MTT G-14/AS probably due to some accident. After all in units the two types lived together and, although the Erla G-10 had an enlarged lower nose section that part could probably be adapted to fit.
Obviously, we have to rely on theories, because certainty on such versions is still hard to achieve...
Hope this helps