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HMC769 not lock in fractional mode

Hello, I am using the HMC769 perfectly in integer mode, but I cannot configure it for the same frequency in fractional mode.

I am setting only the following registers and in that order:

'0' & "000001" & x"000002" & '0' --reg1 -> power up

'0' & "000010" & x"000001" & '0' --reg2 -> ref divider

'0' & "000110" & x"021D1F" & '0' --reg6 -> fractional mode without trigger, rdiv disable

'0' & "001011" & x"01E071" & '0' --regB -> PD active filter

'0' & "001000" & x"036FFF" & '0' --reg8 -> ANALOG rf_div x2

'0' & "000011" & x"00002D" & '0' --reg3 -> 45 integer reg for 9050MHz

'0' & "000100" & x"400000" & '0' --reg4 -> 4194304 fractional reg for 9050MHz

format 1bit & 6bit(REG) & 6hexa(DATA) &1bit , 50MHz clock ref

Could someone help me and tell me what could be wrong?
Thank you!
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