In this circumstance, there is no viated intention from 
the paying party. Thus, the paying party can only 
claim that his contract with the decorator is void. 
Such a claim can be done based on tort or based on 
the ‘reliance damages’ of payments made through 
unjust enrichment. 
Those two limitations are considered by modern 
scholars as an outdated theory and could no longer 
apply in today’s legal system. Nowadays, the 
limitations are reformulated from the ‘viated 
intention’ into the ‘unintended transfer’ because 
legally, the intention of the paying party is to engage 
in a contractual relationship and to make a legally 
binding payment. Yet, the request of restitution is 
made because the contract is defective. (Vout, 2005) 
In a similar vein, the second limitation is altered from 
the ‘total failure of consideration’ into ‘unintended 
gift’. This formulation is used when the payment 
made as a result of a commercial engagement, not as 
a gift. In other words, the paying party does not intend 
to award a gift to the party receiving the payment. 
Moreover, the modern jurists pointed out that if a 
contract is void whereas one of the parties has not 
made any achievements or obligations under such 
contract, then the party who has not obtained the 
contra-achievement may file a claim on the basis of 
unjust enrichment. The claim cannot be proposed 
based on the material claim because the status of the 
claim is in personam not in rem, in the sense that what 
the plaintiff initially demanded the performance of 
the defendant's duty, not the demand to return the 
payment given to the defendant.  
In personam jurisdiction is a jurisdiction over 
individual (person), which means that the court has 
the authority in deciding the case of the defendant for 
the unlimited amount and concerning all of his assets. 
Meanwhile, in rem jurisdiction is a jurisdiction over 
things (res) in the forum country area, which is 
directly or indirectly related to the encountered case. 
(Harley, 2010) However, in Indonesia, the claim that 
distinguishes the in personam and the in rem lawsuit 
has yet been used nor understood by legal 
practitioners in Indonesia. 
Based on the explanation supra, it can be derived 
that the concept of unjust enrichment in the first stage 
is known as one of the engagement forms that creates 
rights and obligations, in addition to the commitments 
arising out of the agreement. As the basis for the 
emergence of the engagement, unjust enrichment 
doctrine also indirectly raises the rights and 
obligations of the parties for the profit and loss arising 
from the state of unjust enrichment.  In this case, 
Kantian attempted to interpret Aristotle’s original 
idea of the relationship between rights and obligations 
by stating that the relationship between profit and loss 
refers to as the relationship between rights and 
obligations. Aristotle (1894) observed that:
 
 
‘Gain’ is what it is generally called in such cases, 
even though in certain cases it is not the appropriate 
term, for instance, for one who struck another – and 
‘loss’ for the one who suffered-but when the suffering 
is measured, it is called a loss for one party and a 
gain for the other.” 
Based on Aristotle’s observation above, it can also 
be taken into account that the position of profits and 
losses is a mutual reciprocity, that if a party earns 
profits then in the other hand, another party will 
receive losses. Bearing in mind such position, 
Aristotle added that the corrective justice aspires the 
equality between the parties, so that if there is an 
event which disturbs the equality between parties and 
causing unjustness, then the corrective justice seeks 
to make the failing party to correct the losses that have 
occurred by returning the profit to the suffering party. 
By doing so, at a time the act eliminates both profit 
and loss, the parties will then return to the equal 
position again. (Weinrib, 2012) 
Aristotle considered that it is the duty of a judge 
to be able to restore justice in the form of equality 
between such profits and losses among the parties. 
(Harahap, 2005) Thus, the emerged profits and losses 
also must have interrelated relationship. However, 
this relationship will then restricts the demand for 
restitution against a person, in which someone cannot 
demand a refund of payment to any person as he 
pleases, but these demands can only be requested to 
the parties who clearly benefit from the harm he 
suffers. This is what distinguishes the corrective 
justice and the distributive justice, whereas the 
distributive justice involves various profits and losses 
in accordance with several criteria. Within 
distributive justice, instead of solely putting one party 
as the perpetrator and the other as the injured party, 
distributive justice further divides the existing profits 
and losses to all parties. Furthermore, distributive 
justice does not limit itself to the relationship of two 
parties, but it can also be constructed between more 
than two parties. (Weinrib, 2012) 
The concept of profit and loss in unjust 
enrichment cannot be equalized with the profit and 
loss of engagement arising from the contractual 
relationship or unlawful acts. In Indonesia, the 
formation of loss within its civil code originated from 
the tort of unlawful acts. Based on the provision of 
Article 1246 of BW, it can be seen that the element of 
loss in tort consists of cost, loss, and interest. 
(Muhammad, 1982) At the same time, the losses in 
unlawful acts are not clearly stipulated. It is only