Hi Hans,
We can use multiple inits with different selections. as my guess in your case your using same values for CPUDT. That may cause.
Do one thing, Try to do the single init as
bukrs=4000,700
kunnr= 55000000 to 56999999
cpudt = 10.12.2013 to 31.12.9999
it may work if kunnr is not an issue in BUKRS 7000.
Thanks