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[DRG]

The original document also mentions Poland ......" also possess 98mm mortar bombs, each containing 12 GKO DPICM submunitions"

also the "9M218 rocket" listed in the http://www.unhcr.org/refworld/pdfid/48d748f723.pdf link you provided is a ........"122 mm Unguided Rocket Projectile with Shaped-Charge Fragmentation Submunitions Scattering Warhead " according to http://warfare.ru/?linkid=2367&catid=254

9M218 122 mm Unguided Rocket Projectile
with Shaped-Charge Fragmentation Submunitions
Scattering Warhead

The RP is designed to engage the soft-skinned materiel (ICVs, APCs, self-propelled artillery mounts), manpower, helicopters and aircrafts on landing sites.

Technical specifications
Caliber 122 mm
Weight 70 kg
Weight of the warhead 25 kg
Number of submunitions 45
Length 3037 mm
Range of fire up to 30 km
Thickness of the homogenous armor 100..120 mm
Operating temperature range
of the combat employment
-50..+50 °C

so I don't think this is about 120mm mortars

Don