Filled fields become blank in DSO change log

Hi experts,

I find an unusual behavior in DSO activation.

For some records for which I find in PSA, new data table (and in debug also!!!) correct data, when the request is activated I find in change log table all characteristic fields empty; the key fields and key figure fields are ok and correct in all tables.

It happen randomly for some orders and for a few requests.

It happen when I have one storno record, for example:

PSA (order, item, customer, material, storno, quantity)

10000, 10, AAA, YYY, , 25

10000, 10, AAA, YYY, X, -25

DEBUG (order, item, customer, material, storno, quantity)

10000, 10, AAA, YYY, , 25

10000, 10, AAA, YYY, X, -25

CHANGE LOG (order, item, customer, material, storno, quantity)

10000, 10, AAA, YYY, , 25

10000, 10, , , X, -25

ACTIVE DATA (order, item, customer, material, storno, quantity)

10000, 10, AAA, YYY, 25

In some other cases:

ACTIVE DATA (order, item, customer, material, storno, quantity)

10000, 10, , , -25

Have you some ideas? It is very strange.

We are on a 7.0 BW system, but with 3.5 data flow (update rule).

Thanks in advance.