the field VAKEY is actually the link to your info record.
This is a combination of vendor, material, purchasing org, plant , and info record indicator.
data: begin of ZZVARKEYA,
ZLIFNR like LFM1-LIFNR,
ZMATNR like MARc-MATNR,
ZEKORG like LFM1-EKORG,
ZWERKS like MARC-WERKS,
ZINFTYP like EINE-ESOKZ,
end of zzvarkeyA.
the link from the info record to the condition is depending on the level of your info record
you can have an info record at purchasing org level, at plant level. And info records for material groups instead of materials. Based on that SAP uses either table A017; A018, A025 to establish the link to the condition tables.
With the right VAKEY comibination, COND_A finds the corresponding info record and creates an record in one of this tables (A017; A018, A025 ) and in the usual condition tables KONH and KONP