Hey I have some company data and i run a panel regression with firm fixed effects. I have a list of firm level controls. I run the regressions across 2 groups as given below

Code:
 reghdfe pm p_diff l1.pm dd ddXp_diff rnd f_vol ind_vol mkt_conc ind_tang sales_growth net_ppe if sd==1, absorb(co_code)
reghdfe pm p_diff l1.pm dd ddXp_diff rnd f_vol ind_vol mkt_conc ind_tang sales_growth net_ppe if sd==0, absorb(co_code)
Now i am interested in the comparing the "ddXp_diff" coefficient. Hence i did the following after each of the regressions
Code:
est store coeff1
est store coeff2
suest coeff1 coeff2
I get the error
unable to generate scores for model age2
suest requires that predict allow the score option
How do i use suest in reghdfe?