PMG Estimation: Imposing LR Coefficient(s)

[MT_MANC]

Looking for some assistance on my existing .prg on PMG estimation:
I have a v. simple PMG estimation:

Code: Select all

equation Gmanu_Gbp.ardl log(Gmanu) log(Gbp)

I wanted to test & impose a unit coeff on Gbp in the LR equation; I presume this is possible ?
I defined a new variable:

Code: Select all

genr GmanuGbp=(Gmanu/Gbp)

then tried to estimate again:

Code: Select all

equation Gmanu_Gbp.ardl log(GmanuGbp)

but got an error dialogue:
see PMG_Eviews_Dialogue1.jpg
then tried with a constant:

Code: Select all

equation Gmanu_Gbp.ardl log(GmanuGbp) C

but got an error dialogue:
see PMG_Eviews_Dialogue2.jpg

Any guidance on imposing/testing LR coefficients appreciated