That's something absolutely strange...
Can you show the EPM report with all base members of P_EA3700 with ACCTYPE for each member and the amount for one month and:
AUDITTRAIL = ECC
CATEGORY = Actual
RPTCURRENCY = LC
RCOST_CENTER = RCCA_NONE
TIME = some single month
COST_CENTER = some cost center
Can you check that aggregation on parent node is OK? (INC have to be reversed sign for aggregation).
Show parent P_EA3700 on this report also.
B.R. Vadim