BPC: *PUT instruction generate multiple rows

Hy,

I've hust found a strange behaviour with this instruction:

*PUT (EXPRESSION=0,ACCOUNTL="CTL_FLAG",DATASRCL="INPUT",CONSOLVIEW="LC",INTCO="NON_INTERCO",ACCDETAIL="F_CLO")

*commit

with an existing value of 1, instead of generating a single -1 row to obtain a total of 0, it generates 59 identical row of -1 and the total is -58

59 is not significant for me, not the total number of the entities nor the number of entities involved in the use of the account CTL_FLAG....

Moreover the logic has not been modified for 2/3 years and it was working fine. I had no opportunity to check system/software configuration for changes...

Any idea on what to check???

Thanks