It is always initial.
This is the value for the IT_DIMENSIONINFOOBJECTS Table while debugging after calling FM BAPI_CUBE_CHANGE.
As you see, I get the new line with double underscore and X
ZTEST_NAV A ZTEST_NAV1 0001 0MATERIAL
ZTEST_NAV A ZTEST_NAV1 0002 0CUSTOMER
ZTEST_NAV A ZTEST_NAV2 0001 0PUR_GROUP
ZTEST_NAV A ZTEST_NAVP 0001 0CHNGID
ZTEST_NAV A ZTEST_NAVP 0002 0RECORDTP
ZTEST_NAV A ZTEST_NAVP 0003 0REQUID
ZTEST_NAV A ZTEST_NAV1 0003 0CUSTOMER__0ACCNT_GRP X
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