FM General Budgetary Ledger - negative posting

Hi, guys.

There is a problem with the budgetary ledger document for FM payments.

SAP ECC 6.0; sap-appl 606; ea-ps 606

FM: BCS activated, document splitting activated (rule 000...012),

Budgetary ledger settings:

doc.type for BL: XB (business transaction  0000, variant 0001);

negative posting: X;

posting keys: 40,50

FMBLEXT for actual postings:

source: company code (1000) and value type (57)

target:   gl account: 801 and 802

            gl offset account : 800

I posted a document in FI with (with no negative posting), that is updated in FM with value type 57, amount type 0250:

expense account (comm.item: 30/3)= bank account (comm.item 90/1)    100 usd

The BL document that is generated has negative postings:

%    = 800    -200    (posting key 40, negative posting: X)

801              -100    (posting key 50, negative posting: X)

802              -100    (posting key 50, negative posting: X)

It should be:

800   =   %    200

            801   100

            802   100

Any ideas what should I do to correct the situation?

Thank you in advance.