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Just my guess.

This phrase occurs in legislation in the Czech Republic in the field of
public procurement under EU rules. In the given context, this appears to be large-scale works relating to flood prevention measures. This sum
is deposited in the customer's ban account to ensure performance by the tenderer whose bid is accepted. See below.


The sealed quotation bidder who receives the notice referred
to in Sub-rule (10) shall enter into the procurement contract by
furnishing a cash guarantee in a sum to be set by five percent of the
price quoted by the bidder in cash or the performance guarantee issued
by a commercial bank, no later than seven days after the date of receipt
of the notice.