issue with template and batch node

hello

wil will to "template" a working tikc script, for Kapacitor, I encouter issue with using variable in the SELECT cuase of a batch node:

here is some part of the script:

var measurement string
var groupBy string
var indicator string
var offset duration
var period duration
var every duration
var shift = offset
.....
var prev_period = batch
|query('SELECT mean(indicator), stddev(indicator) from .measurement(measurement)')
.groupBy('devaddr')
.offset(offset)
.period(period)
.every(every)
.align()
|shift(shift)

when trying to "load" the template , I've got

error reloading associated task xxxxxxxxxx: failed to parse InfluxQL query: found ., expected identifier at line 1, char 49

same error with .db(db).rp(.rp) with db and rp defined as var string.
same without the "."

any hints ?
thans in advance
( Kapacitor 1.4)

regards
Philippe

Start by reproducing the provided TICKscript template with a batch node and variable-based SELECT in Kapacitor 1.4. Trace template loading and InfluxQL parsing; no source file or test is named in the issue. Done means the intended variables parse correctly, or the limitation and supported syntax are clearly documented.

Written by the indexing model from the issue text.